HLN presents a night of must-see true crime documentary series on Sunday, March 18 with the premieres of Death Row Stories season three at 8pm ET/PT - airing exclusively on HLN - and Unmasking A Killer at 9pm ET/PT. Season three of Death Row Stories explores the fallibility of the ultimate criminal penalty, capital punishment, through eight hour-long episodes. Seasons one and two aired on CNN. Unmasking A Killer profiles the Golden State Killer, one of the nation's most prolific uncaught serial murderers.