Every killer has a mark — a signature move after their crime has been committed. Oxygen’s Season 2 premiere episode of “Mark of a Killer” looks into the signs left behind by serial killer ...

MINNEAPOLIS — For a span of three years in the early 1980s, a serial killer taunted law enforcement with confessions related to the deaths of three young women and the brutal assault of another ...

I can't stop myself. I keep killing somebody," he said in one high-pitched call to police, which aired as part of Oxygen’s “Mark of a Killer.” The assailant, who became known as the “Weepy Voiced ...