ansar mohammed was greeted by tearful supporters. an artist from the east coast gave him a portrait he painted of nia waering a death to racism shirt. bart police say john lee cowell stabbed the 18-year-old >>> you know, to speak justice with my daughter. >> they say he stabbed the 18-year-old to death on the bart platform sunday night also wounding her sister. the sister now recovering at home. relativ relatives say the 27-year-old is mentally ill living on the streets. he was released from prison in may after serving time for second-degree robbery. >>> only on nbc bay area we are hearing from the girl that sat next to him when he was arrested. he was taken home from work and said he boarded a train and says could have been her. >> nia wilson could have been any woman that looked like me or her. we shouldn't have to live like that in 2018. >> he saw on social media and immediately recognized him to call police and say how peaceful of it was when he was arrested. >> 4:33. also developing tourists only have a few hours left. noon is t