But the video appearing to show the boys hands up as hes shot chicagos mayor pleading for calm. The Defense Resting in the Derek Chauvin trial. The former officer speaking in court for the first time to invoke his Fifth Amendment right not to testify. When the jury will hear Closing Arguments. Daunte wrights family speaking out for the First Time Since the former officer was charged in his Shooting Death what theyre demanding tonight. The u. S. Hitting russia with new sanctions. And the warning President Biden says he personally gave to Vladimir Putin and bracing for a blast of Spring Snow Announcer this is nbc nightly news with lester holt good evening we may be closer to a definitive answer to one of the nagging questions about Covid Vaccines and that is will we need a followon booster shot later on . Well, the head of pfizer is saying that will likely be the case for his companys vaccine, suggesting an annual shot could be in the cards beginning a year after being fully vaccinated the idea, to keep your bodys defenses up against the virus, especially the variants well also dig into the number of people infected despite being fully vaccinated some interesting numbers to share with you there. Especially considering 126 million have received at least one Covid Vaccine dose in this country were also watching hospitalizations tonight at 38,000. Lets begin our coverage now with miguel almaguer. On the count of three. One, two, three. Reporter for the tens of millions of americans inoculated with the Pfizer Vaccine tonight new word theyll likely need a third shot, a booster dose, within 12 months of being fully vaccinated pfizers ceo says like the flu shot the vaccine could be annual the variants will play a key role. It is extremely important to suppress the pool of people that can be susceptible to the virus. Reporter the pfizer news comes as the future of the Johnson Johnson shot remains unclear. But just the decision to pause is having an impact i saw patients today who were scheduled for Johnson Johnson and when i told them we needed to reschedule they were like no, thank you reporter with 7. 6 million americans already inoculated with j j the six women with rare Blood Clotting experienced it within two weeks. Roughly 3. 8 Million People are still in that window. Some hospitals like this one say in recent days those just inoculated with j j have been showing up to their e. R. S with no symptoms and no medical problems but are instead overly concerned. Today on capitol hill leading Health Officials sought to reassure the public. At a time when covid cases are climbing, authorities are trying to ensure Public Confidence isnt dropping miguel almaguer, nbc news all right lets put it into context. Dr. John torres joins us now john, if pfizer is talking yearly booster shots, what does it say about how long the vaccines provide protection right now we know the vaccines are very effective in providing at least six months of protection from the virus. But until they study immunity recipients six months out were not going to know conclusively now, pfizer thinks well need a booster shot in 12 months time frame and maybe annually after that. Moderna says theyre working on a booster shot and hoping to combine it with the flu vaccine so you can get both at once what we dont know at this point is whether you can switch between different types of vaccines for that booster shot but hopefully will soon all right, doctor, thank you. Lets turn now to the breaking news from chicago. Police video just released of a deadly officerinvolved shooting this one involved a 13yearold boy. It happened late last month. We need to warn you the images are disturbing rehema ellis is there. Reporter in the Dramatic Police body cam video officers are responding to a call of shots fired in the Early Morning hours of march 29th in chicagos Little Village neighborhood in a matter of seconds a pursuit turns deadly stop right now show me your [ bleep ] hands. Stop it. [ Gunshot Reporter 13yearold adam toledo was killed. Police say a gun was found at the scene the officer screamed at him, show me your hands. Adam complied. Turned around. His hands were empty when he was shot in the chest. Reporter so far police have not released any information about the officer. They arrested a 21yearold man who they say was with toledo at the time spin. Put your hands behind your back. Reporter ruben roman, arraigned saturday, was charged with Child Endangerment and reckless discharge of a firearm. Chicagos mayor became emotional today talking about the video. No parent should ever have a Video Broadcast widely of their childs last moments. Reporter earlier this week toledos family saw the video and did not want it seen immediately but today they agreed it should be viewed by the public and they called for calm now that the video has been released, the city is on edge tonight. And bracing for more demonstrations lester all right, rehema, thank you. In Minneapolis High Drama in the murder trial of Derek Chauvin. The Defense Resting its case and the former Police Officer making his decision on whether to testify about the death of george floyd our Gabe Gutierrez has late details reporter it had been one of the largest questions looming over the trial, whether Derek Chauvin would take the stand in his own defense. Today the answer i will invoke my Fifth Amendment privilege. Reporter chauvin told the judge without the jury in the room that he would not testify. I have advised you and we have gone back and forth on the matter, would be kind of an understatement right . Yes, it is. Reporter George Floyds younger brother rodney says it had been on his mind i was hoping to see him get on that stand. But he didnt do it. You wanted to see him testify . Yeah. I wanted to see him accept some Accountability Reporter but legal experts say chauvins choice is no surprise. The biggest risk for putting Derek Chauvin on the stand is that he does the exact opposite of what you want him to do instead of humanizing himself he comes across as looking cold to the jury, which further proves what the state is already trying to establish, that hes the direct cause of George Floyds death. Reporter also today prosecutors tried to introduce as new Evidence Test Results that specifically measure the Carbon Monoxide in floyds blood. The judge did not allow it its untimely reporter scolding them for waiting until the last minute and warning that bringing up the previously undisclosed lab test to the jury could result in a mistrial this late disclosure is not the way we should be operating here reporter instead the prosecution called a sole rebuttal witness, dr. Michael tobin, back to the stand. The worldrenowned pulmonologist disagreed with yesterdays Defense Expert who testified exhaust from the Police Squad Car could have been one of the contributing factors in floyds death i believe it is not reliable reporter Closing Arguments are now set for monday then the case will go to the jury, which will be sequestered. If i were you, i would plan for long and hope for short whether its an hour or a week, its entirely within your province gabe, im curious why is the Court Waiting until monday for Closing Arguments . Reporter well, lester, the judge had indicated that he did not want the jury deliberating this weekend. Also, the prosecution and defense are still hammering out the exact wording for jury instructions, lester Gabe Gutierrez tonight, thank you in just 60 seconds, packing the Supreme Court. The controversial proposal in congress to expand it to 13 justices and in our series American Extremism, a program to help people get out of hate groups tension remains high in brooklyn center, minnesota this evening. The former Police Officer who shot and killed Daunte Wright during a traffic stop making her First Court Appearance after being charged with manslaughter as his family speaks out tonight. Ron allen is there were still never going to be able to see our baby boy that were never going to have again reporter tonight Daunte Wrights family demanding tough justice for Kimberly Potter if we can have life we want life weve got to go life without him. Weve got to go life without him. Reporter the former Police Officer in court today the media barred from showing it to the public charged with seconddegree manslaughter facing up to ten years in prison for Killing Wright during a traffic stop his family able to see potter in court on zoom it hurt my heart to see her sitting there. So many emotions flowed through my body i had hate i had sadness. I had anger. Reporter overnight a fourth night of outrage. Hundreds of officers moving in to enforce the curfew get back reporter our nbc news team briefly detained by authorities, then released at least two dozen arrests. Today minnesotas governor, who said he spoke to wrights family, vowing to push for Police Reforms youre less safe to be black in minnesota than you are to be white right now. Reporter meanwhile, wrights Family Planning his funeral for next thursday nobody should have to go through this i dont care white, black, brown, red, orange, whatever you are. Reporter ron allen, nbc news, brooklyn center, minnesota. All right. Lets switch gears to the Biden Administrations tough new sanctions on russia for interfering in american president ial elections and those Hacking Attacks on u. S. Government agencies and big companies. Lets get more from andrea mitchell. Reporter as tensions rise with Russian Troops massing on the border with ukraine, the Biden Administration today slapping tough new financial sanctions on moscow for a massive hacking operation against Government Agencies and the nations largest companies. Interfering in u. S. Elections and bullying ukraine. The state Department Also expelling Russian Diplomats the u. S. Says are spies President Biden warned russian President Putin of the sanctions in a call but also proposed the two meet at a summit. I was clear with President Putin that we could have gone further but i chose not to do so i chose to be proportionate. Reporter russia responding tonight saying u. S. Aggressive behavior will certainly lead to a decisive rebuff. Meanwhile, only hours after the president s historic decision to withdraw u. S. Troops from afghanistan, Secretary Of State blinken made a surprise trip there today. I know this is a moment for many of mixed emotions these are hard choices, hard decisions. Reporter but the cia warns theres a significant risk al qaeda could regroup. The military wanted to leave a small force. Afghans worry the taliban will take over and women and girls lose their rights and the taliban tonight is declaring victory. Lester andrea, thanks. A lot of talk right now in washington over the idea of Court Packing. Some Progressive Democrats today calling to expand the number of justices on the Supreme Court. And it is sparking a backlash tonight Peter Alexander tells us more. Reporter it would be a monumental change for an institution that has not added justices in more than 150 years. But tonight several Progressive Democrats say they want to increase the number of seats on the Supreme Court from 9 to 13 we are here today because the United States Supreme Court is broken. It is out of balance and it needs to be fixed. Reporter that democratic plan would make the court liberal after former president trumps picks created a 63 conservative majority President Biden as a senator criticized Court Packing as a bonehead idea. But just last week launched a commission to study adding more seats. Speaker nancy pelosi wont bring the democratic proposal to the floor but did not rule it out in the future i think its an idea that should be considered reporter the late Justice Ruth Bader ginsburg opposed it. If anything would make the court appear partisan it would be that reporter and republicans are slamming it as a dangerous liberal power grab i can tell you what Court Packing is, though it will be the end of the Supreme Courts legitimacy and the end of the rule of law in america. Reporter the pressure on President Biden from Progressive Democrats is likely only to grow with his Court Commission expected to release its report this fall lester all right, peter, thank you. In our series on American Extremism now youve heard us reporting on the growing threat, but tonight Hallie Jackson looks at a Rescue Program for people caught up in hate. Do you know if hes ever condoned violence reporter at parents for peace the phones keep ringing. When covid happened, our help line tripled reporter executive director Miriam Churchill says its not just because of the pandemic did the events of january 6th have any impact on your help line that you could see . Yes the help line number was just hot, hot, hot. Reporter on the line, people who want to get their loved ones out of all kinds of hate groups ideologies from White Supremacy to islamic radicalism people that are using hate, they are selfmedicating themselves with hate i think its an addiction. Reporter its why they do interventions. These days on zoom and we were granted rare access to listen in as their caller joined on speaker phone. We agree your husband needs help i appreciate the support. Reporter were obscuring her identifying details but can say she wants help for her husband, who drinks, goes online, and sinks deeper into hate he would say if half the population were wiped out things would be better. Was there a point when you saw that your husband was getting increasingly radicalized . Yeah. I would say it was after the capitol riots. Reporter she searched and found the parents for peace website, which features a photo of a former White Supremacist. I thought, wow, like if only i could just get him in the same room with my husband, this is what might be able to reach him better reporter that person is chris buckley. He says he joined the kkk in 2013 after he left the Army Following a bad humvee crash and got addicted to painkillers, then crystal meth you were actually training other members of the klan to fight yeah. Yep. Reporter A 2015 Documentary Shows Buckley with his then preschoolage son. White power white power i was grooming him. He threw a fit until we made him a robe that matched mine. Reporter in 2016 his wife reached out for help and within weeks another former White Supremacist showed up at buckleys door for an intervention. It was the most agonizing, exhausting, emotional Roller Coaster that ive ever been on. Reporter buckley is now helping others out of hate. For every one that i recruited while i was in, i can take ten more back. Reporter new research from rand shows stigmatizing extremists or punishing them can be counterproductive. So parents for peace looks for other ways to help people who love people who hate we are guiding families to be First Responders reporter like that Help Line Caller whos separating from her husband. This is a shock to the system but its starting to have the effect that i hoped for him, is that hes reaching out for help now. Thats why im trying to do what im doing with love, because what else can combat hate better than love . Reporter for her now its hope over hate Hallie Jackson, nbc news, Washington Well take a short break. Up next, whos getting covid after vaccinations what you need to know. Wanna help kids get their homework done . Well, an Internet Connections a good start. But kids also need computers. And sometimes the hardest thing about homework is finding a place to do it. So why not Hook Community centers up with wifi . For kids like us, and all the Amazing Things were gonna learn. Over the next 10 years, comcast is committing 1 billion to reach 50 million lowincome americans with the tools and resources they need to be ready for anything. I hope youre ready. cause we are. A blast of spring snow is taking aim tonight. Winter storm alerts are in effect for parts of new york and new england. High elevations could get up to 10 inches. More now on the race to vaccinate. The cdc releasing its first data on covid Breakthrough Infections in a small number of fully vaccinated people. So what is your potential risk tom costello with a reality check. While more than 76 ericans have now been fully vaccinated, the Cdc Reports A very small number of breakthrough cases. People contracting covid despite being vaccinated so far 5,800 known cases, most of them women. 40 involve people over the age of 60 7 had to be hospitalized 1 , 74 people, died. Experts say the infections are similar to people coming down with the flu despite getting the flu vaccine. Ariel silver got covid six weeks after her second Covid Vaccine dose for two days i was in bed very sick, sleeping all day i had to cancel all my Work Phone Calls it hit me hard for sure at a certain point my fatigue went from oh my god, im tired to oh my god, i cant really move. Reporter dr. Evelina gravener also got sick after being vaccinated im actually afraid to think what my symptoms could have been like if i wasnt vaccinated reporter the data tells the story, showing the pfizer and moderna vaccines are at least 94 effective in preventing severe the j j vaccine, 86 effective in preventing severe disease. That means only a small percentage of vaccinated people are likely to still get covid, though most should not end up in the hospital the vast, vast majority of people who have been vaccinated and get covid, theyre going to have mild illness, maybe moderate illness and should be able to recover at home. Reporter the Covid Vaccines actually provide far more protection than the typical flu vaccine, which has been 50 to 60 effective in recent years and the current vaccines do appear to protect against the uk variant, now the most common strain in the u. S. The biggest concern is that people who do become sick despite being vaccinated could still spread the virus to others. Infectious disease experts point out no vaccine offers 100 protection lester we keep learning so much about all this. Tom, thank you up next well celebrate the enduring legacy of a music trailblazer. Finally, she would have turned 50 this week now 26 years after tejano superstar selenas tragic death, her music is inspiring a new generation heres morgan radford. Reporter shes known as la reina, la leyenda, the queen of tejano but for millions of fans around the world shes known by one name selena an inspiration for all of us. Especially for the Latino Community i think of her as a role model our moms listen to the music and so theyll put it on. [ speaking Foreign Language ] when theyre cleaning the house yeah. Reporter born 50 years ago, Selena Quintanilla became one of the most influential latin artists of all time, debuting in spanish with a selftitled album in 1989. And then in english, becoming the first latin artist to ever top the billboard 200. All before the age of 24 her life tragically cut short in 1995 by a fatal gunshot from her former fan club president. And yet today her legacy is greater than ever her music now inspiring a new generation bidi bidi bom bom with more than 213 million streams on spotify this year alone and through the hit series selena on netflix. Now entering its second season. What did it mean for latinos to have someone like selena then, and what does it mean now the selena story is inspiring not just to latinos but also to anyone who feels like an outsider around the world. Reporter an influence that still resonates today. She says the impossible is always possible selena taught you that yeah. Reporter morgan radford, nbc news, los angeles. And before we go a note about inspiring america. Its expanding into a new franchise across the Nbc Universal news group to honor people making an impact kicking off with a special primetime event ill host with Savannah Guthrie and hoda kotb on may 1st well reveal the 2021 inspiration list, featuring the stories of some of the people making a real difference in our country. Thats nightly news for this thursday. Im lester holt. Please take care of yourself and each other