alza castile was his sister. >> it's like we're animals. rn day lynching we're seeing going on only we're getting killed on camera. >> reporter: valerie castile lost her only son. >> he did everything by the law and he died by the law. >> by the hand of the law. >> reporter: castile worked in a school cafeteria in st. paul. he would have celebrated his 23rd birthday tomorrow. castile's gun was taken from the scene and turned over to police for processing. >>> the just department is investigating another shooting of a black man, alton sterling was shot where he was selling cd's. here's david. >> reporter: those candles on the ground behind me is where alton sterling died. somebody painted a mural of his face outside the store where he sold cd's for years. they believe their as were justified. this morning there's a second video and it is very clear but we want to warn you it's graphic. the second video is taken from a closer angle and appears to show alton sterling pinned down by two batten rouge police officers. moments later sterling is sho