With calling cards and signatures, these serial killers let the world know they were behind some of the sickest crimes imaginable.

Richard W. Rogers made headlines in Maine years before he dismembered gay men in the NYC — for killing a roommate who allegedly made a pass at him.

Danny Rolling, aka the Gainesville Ripper, left behind an hour-long tape featuring songs and an apology to his family, right before he killed five students in Florida.

Danny Rolling killed five students in quick succession in August 1990 — leaving something behind at the crime scenes he so carefully posed. 

Danny Rolling, the serial killer imprisoned for killing five Florida college students, forged a strong bond with a person who informed on him — and asked him to be his mouthpiece.

Danny Rolling killed five students in Florida in 1990 — and his explanation for it included childhood abuse, multiple personalities, and Ted Bundy.

Danny Rolling was sentenced to death for a spree of horrific murders in northern Florida — but his last moments were chilling in their own way.

"Mark of a Killer" examines the disturbing behaviors of serial killers.

From possessive and dominating Anthony Sowell (Leo) to detached and self-centered Charles Ng (Capricorn), serial killers embody the worst traits of the stars.