S4/EP4 While reflecting on the murder of Melissa Sowders, a Harris County assistant district attorney and a local detective explain what exactly makes a killing a capital murder charge and why they pursued it in the Sowders case.

S4/EP4 Police weren’t sure whether their suspect was telling the truth after he was captured on audio bragging about where he disposed of Melissa Sowders’ body. But a search commenced — and meanwhile, a ring also shed light on the case.

S4/EP4 Loved ones, including Melissa Sowders’ father, recall the agony of searching for Melissa’s body and looking for closure. Would they ever be able to find her?

S4/EP3 Shortly after the Maurins were killed, the Green River Killer murdered a woman named Debbie Bonner and dumped her on the banks of the Green River in Lewis County. Here’s how the resulting crime spree affected the Maurin case.

S4/EP3 Edward and Minnie Maurin’s grandson recalls his final moments with the couple, while an investigator describes the shock and terror the killings inspired in the tiny, tight-knit community. Who could have killed them?

S4/EP3 In 2009, 24 years after the Maurins were killed, the lead detective retired and LCSD detective Bruce Kimsey took over. He decided to colorize and expand the old photos in the case file — which led to a possible breakthrough.

S4/EP2 Journalist Wendy Williams analyzes how the white and Black populations in Dayton, Ohio, have been segregated on opposite sides of the Miami River. The white side is more apparently affluent, with more resources, while the predominantly Black side is not.

S4/EP2 Danita Gullette's family kept their holiday traditions going in the wake of her death.

S4/EP2 Unfortunately, Sergeant John Huber found himself working homicide cases on several Christmases.

S4/EP1 Laurie Jones, Lisa Guy's best friend, describes the day she learned that her friend had been murdered. She finds solace in knowing that Lisa is "at peace" with her husband.

S4/EP1 To protect the safety of their officers, investigators had to call in biochemical cleanup teams to handle the bodies decomposing in the blue tubs.

S4/EP1 Det. Jeremy McCord of the Knox County Sheriff's Office explains the teamwork between law enforcement and the community to conduct a successful investigation.

S4/EP2 A teenager in Dayton was shot several times on Christmas Eve, and bullet casings provide clues about her killer.

S4/EP2 Police talk to a witness who survived a deadly robbery in Dayton, Ohio, the day after Christmas.

S4/EP1 A receipt found in the Guy residence could provide detectives with the information they need to piece together a timeline for these murders.

S4/EP1 Lisa Guy was expected at her own retirement party, but failed to show up. Local law enforcement visited her home to conduct a welfare check, but received no response.