admitted to an affair, but denied the killings, in an exclusive interview with diane sawyer. did you murder your wife? no, no. i did not. reporter: tonight, peterson s attorney maintaining his innocence and saying the judge denied his client s request to speak at the hearing. he wanted to make it clear that there is no way he could have possibly harmed lacy and connor. reporter: and david, scott peter zone is still trying to get his conviction overturned. his lawyer is asking for a new trial and they have a hearing for that in february. david? all right, kayna whitworth with us tonight, as well. kayna, thank you. meantime tonight, on capitol hill, the head of instagram grilled about its effects on children, particularly young girls. so, what s being done and how soon? rachel scott on the hill tonight. reporter: tonight, the head of instagram appearing before congress for the first time, defending the popular social media app from blistering bipartisan criticism that ins
confront bd lacy s still grieving mother and siblings. and why was he in court? here s kayna whitworth. reporter: it with us a case that horrified the nation. and tonight, scott peterson is back in court. long after the christmas eve murders of his wife lacy and unborn son, scott peter zone in court today, because the california supreme court overturned peterson s death sentence last year, ruling jurors in his original trial were improperly screened for bias about the death penalty. because of that, peterson no longer faces the death penalty. the judge today resentencing him to life in prison without parole. and lacy peterson s heartbroken family once again finding themselves in court with the man who killed their daughter. lacy s mother confronting him, telling him, quote, lacy and connor will always be dead and you will always be their murderer. peterson sitting in silence. lacy s sister in tears, telling hip, it makes me sick being here today in front of you again. nearly 20 years
because that s what mothers do. reporter: bryant detailing the last phone call with her son as he was pulled over for an air freshener in the rear view mirror, which is illegal in minnesota, and an expired tag. he just sounded really nervous but i reassured him that it would be okay. reporter: the call abruptly ending. that mother later making a video call. a woman in the car with wright answering the phone. she said they shot him and she faced the phone towards the driver s seat. and my son was laying there and he was unresponsive and he looked dead. reporter: bryant rushing to the scene. i didn t want to believe that was my son laying there on the ground, but i could tell it was him because of his tennis shoes.