The details of Celeste Rivas Hernandez’s murder just keep getting darker. We’re now confronted with disturbing facts uncovered in the preliminary hearing evidence brief for the accused killer, David Anthony Burke, known as D4vd. They’re things you can’t unhear… the court document reveals he purchased an inflatable kiddie pool to contain her blood, stood by while she bled to death, and returned to the location where he dumped her belongings - twice.

We had to talk to someone with experience analyzing the most gruesome of crime scenes, so in this episode, we’re joined by crime scene investigator Sheryl "Mac" McCollum. Investigative reporter Anne Emerson asks the gritty questions, and we don’t shy away from the answers, especially those swirling around motive in this case. We ask Mac point blank - could Celeste have been pregnant? Hear her answer, and her take on this horrific case.

Read Sheryl’s latest book, ‘Swans Don't Swim in a Sewer: Solving the Cold Case of the Flint River Killer's Daughter’

Learn more about Sheryl’s work with the Cold Case Investigative Research Institute