Get prepared, true crime fans. 

Catching a Serial Killer: Sam Little is coming to Oxygen (on Sunday, Apr. 12 at 7 p.m.) as part of its 12 Dark Days of Serial Killers event, and you can watch the exclusive trailer here. 

Just two years ago, 78-year-old Sam Little confessed to murdering over 90 women across 17 different states on a killing spree lasting 35 years. Since then, the FBI has confirmed 50 of his victims—making Little America's most prolific serial killer. 

In the trailer, former prosecutor and investigative journalist Beth Karas talks to a number of key players in Little's case, including alleged survivors. 

"I remember thinking, 'I'm not gonna make it out of this,'" one woman tells Karas.

Some of Little's self-proclaimed victims are also featured in the clip, as Little has been tasked by law enforcement to personally sketch their faces in hand-drawn portraits with hopes of identifying those that are still unknown.

Little himself can be seen too, both in court and while being interviewed by authorities.

"They didn't know who the hell was doing it," Little says. "I would go back to the same city sometimes, pluck me another grape."

This element—Little going undetected for so long—is an important one for Karas. At one point in the preview, she asks, "How did Sam Little get away with this for three-and-a-half decades?"

Perhaps Catching a Serial Killer: Sam Little will begin to answer Karas' question.

Tune in to the special Sunday, April 12 at 7 p.m. on Oxygen!

(E! and Oxygen are both part of the NBCUniversal family.)

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