july 4th celebrations. what you need to know. severe weather alerts. storms and triple digits in place as heat advisories are in place for 50 million americans. brittney griner s message to the white house. her letter to president biden, handwritten from a russian prison, terrified she might be there forever and on this fourth of july, how freedom means something different to greiner today. shark attack, a lifeguard playing a victim in a training drill is bitten by a shark. schau he fought back. be able to for the social media generation, it s driving fans bananas. this is the cbs evening news with norah o donnell, reporting from the nation s capital. good evening, everyone. thank you for joining us on this july fourth, i m major garrett in for norah. tonight at least six killed and dozens more wounded in the nation s latest mass shooting, targeted an independence day parade in suburban chicago. police have just identified a person of interest, 22-year-old robert e.cremo