Watch The First 48 Season 4 Online

In Memphis, Sergeant Caroline Mason and her team respond to a convenience store shooting, where surveillance cameras captured the last few moments of a man's life. Investigators must sift through the footage for clues that will point them to the killer. And in Miami, Detectives Fernando Bosch and Ricky Martinez are called to a wealthy high-rise condo, where the crime scene blood-covered bathroom. To track down the killer, investigators follow a blood trail that leads them out of the building and into a hair-raising manhunt.