Moment of Proof S03E07 - Episode 7

A few spots of the victim's blood on a blue shirt convict a murderer when police deduce it was likely to be worn on the day of the killing. Detectives are left baffled by an apparently motiveless killing as they try to make sense of items left at the crime scene, but when they finally arrest a suspect, his vanity proves his undoing. Elsewhere, a rapper tells tales on himself when rap videos he posts online about his drug-dealing exploits mean the police come knocking at his door.