The First 48

A man is shot inside his home, a woman calls 911 from inside then flees the scene. Detectives set out to find this woman to see if she is just a witness or if she is a cold blooded killer. A homeless man is stabbed in the park and left to die. Detectives search for clues and get a tip the victim was last seen with a friend. They race the clock to find out if this friend is actually a killer.