Smiley Face Killers Bonus: Brian Welzien's Mother Speaks About Coping with Her Son's Death (Season 1, Episode 4)

Smiley Face Killers: Brian Welzien's Mother Recounts the Day She Learned of Her Son's Death (Season 1, Episode 4)

Smiley Face Killers: Brian Welzien's Body Was Never Tested for GHB (Season 1, Episode 4)

Smiley Face Killers Bonus: Bobby Chacon Looks at Evidence in Potential Smiley Face Killers Cases (Season 1, Episode 4)

Smiley Face Killers Bonus: Retired NYPD Detectives Examine Brian Welzien's Autopsy Report (Season 1, Episode 4)

Smiley Face Killers: Forensic Pathologist Believes Brian Welzien Was Murdered (Season 1, Episode 4)