S1/EP5 Nannette Krenzel's body was dumped in the Pleasant Prairie "Killing Fields," in such a way that suggested to investigators that the killer might have panicked. It could have been hidden better.

S1/EP5 A baseball bat and particular kind of folding knife clearly caused Nannette Krenzel's injuries, but investigators had no DNA from the perpetrators.

S1/EP5 Fuller's Pub was an unusual spot for a murder as vicious as Nannette Krenzel's, which was clearly the work of someone who wanted to inflict "great punishment," investigators say.

S1/EP6 Steven Merritt was found dead, shot four times in the back in Mission Viejo, California, in February 1989. There were few initial clues beyond shell casings.

S1/EP6 Two days into their investigation, detectives got a call from a grocery store clerk, who said he saw a car stalking a pedestrian that night. The pedestrian's description matched Steven Merritt.

S1/EP4 Journalist Matt Chandler was inspired by Larry Wells' wife, Jill, after his murder. She helped the couple's young child deal with Larry's murder by writing notes and sending them via balloon to heaven. Chandler wrote a children's book afterward.

S1/EP4 Det. Sgt. Scott Kashino recalls the command center detectives set up to process the vast amount of leads and evidence arising from Larry Wells' murder in the Hamburger, New York, Toys-R-Us.

S1/EP4 The small town of Hamburg, just outside Buffalo, New York, had a virtually non-existent crime rate, according to law enforcement. That is, until Larry Wells' murder at Toys-R-Us in 2013.

S1/EP5 On Mother's Day, 1995, a nude body — Nannette Krenzel — was found on the side of the road. She had been badly mutilated, and she was the fourth body to be found in this 'killing fields' area in a short period of time, investigators say.

S1/EP5 A tenant in Nannette Krenzel's Chicago apartment complex said she had an encounter recently with some area gangbangers. Authorities felt the vicious nature of her killing was uncharacteristic for gang members, though.

S1/EP3 Buck and Joy Blodgett give talks now about meeting violence with peace, in hope of ending violence against women. Their foundation is called the Jessie's Legacy Project.

S1/EP3 Hartford is a quaint, safe small town where nobody ever locks their doors, residents say. When Jessie Blodgett was killed by Daniel Hartelt, it marked the third murder in 100 years of the community's history.

S1/EP3 Buck Blodgett says he embraced forgiveness over anger after his daughter, Jesse, was murdered by Daniel Bartelt. He's "responding to hate with love, darkness with light," he says.

S1/EP4 A Toys-R-Us employee recalls hearing the alarm go off at 5:45 a.m. He asked another employee to find manager Larry Wells. She found his dead body, instead, as heard on her actual 911 call.

S1/EP4 Surveillance footage revealed a masked and scarfed figure sneaking around the store, eventually making its way to Larry Wells' office.

S1/EP2 Sandy Ackerman remembers the special friendship she had with her sister, Morna Jean Brennen, before her brutal murder. They would go rock climbing and take long trips, getting lost on back roads. The last time she saw her sister, she told her she'd see her on Thanksgiving. But it was not to be.