Josh Mankiewicz talks to Dennis Murphy about his recent episode, “The Killer on Camera 4,”  which follows the 2017 murder of Baltimore volunteer firefighter Jon Hickey, the victim of a love triangle of which he was unaware. Josh asks Dennis about the murderer’s extensive double life and about the security footage that cracked the case. Dennis shares a podcast-exclusive clip from his interview with the killer’s former wife and invites veteran Dateline producer Izhar Harpaz to answer your questions from social media.