A couple vanishes and a week later, they’re found dead in the most disturbing way. In Tampa, 27-year-old Zamil Limon and his girlfriend, 27-year-old Nahida Bristy - both University of South Florida doctoral students - were discovered in black garbage bags, one on a bridge and the other in the water. Their families are left devastated and begging to know why this happened. Police say a trail of evidence led to Zamil's roommate, Hisham Abugharbieh, who has now been arrested and charged with two counts of premeditated first-degree murder.

Investigative reporter Anne Emerson is joined by Dr. Michelle DuPre, a former medical examiner and retired forensic pathologist, as we break down the physical and digital evidence in this case - from blood pools, to garbage bags, to ChatGPT. We detail the criminal complaint, take a closer look at the victims, the suspect, and the unanswered question: why?

Police are asking for the public’s help to move the investigation forward. If you were on the Howard Frankland Bridge in Tampa, Florida in the early morning hours of April 17th and have dashcam footage, police are urging you to come forward and share it: contact the Hillsborough County Sheriff's Office at 813-247-8200.

GoFundMe: Support for Zamil & Nahida's Families