The key to solving the toughest murder cases lies somewhere within the final 24 hours of the victim's life. Following investigators as they piece together events.
When Ben Novak is found dead in his hotel room, detectives discover that the businessman had many enemies. (S5, ep 1)
A gunman kills a volunteer police officer Laura Grillo in her home, leading investigators to link shreds of game-changing evidence to the diabolical culprit. (S5, ep 2)
On Easter Sunday, the remains of a woman are found. Years later, a determined attorney and new DNA technology bring the case to its shocking conclusion. (S5, ep 3)
As detectives reconstruct a single mum's final 24 hours, their suspicions turn to her fiance, a creepy co-worker, and then to a violent ex-boyfriend. (S5, ep 4)
A gunman strikes down an Atlanta-area man in his SUV on the side of a highway. Sheriff Investigators discover the victim is hated by some in his inner circle. (S5, ep 5)
Bookkeeper Barbara Iske is found dead at her client's house. After digging deep, police reveal that Barbara's been the victim of a dark family conflict. (S5, ep 6)
Tray Phelps is murdered just steps from his front door. With no immediate leads, it's up to Missouri investigators to find the murderous mastermind. (S5, ep 7)
In Pennsylvania, Ashley Kline is set on fire and killed. The list of prime suspects soon includes her best friend, her jealous boyfriend and her prison pen pal. (S5, ep 8)
Royal Canadian Mounted Police discover a woman inside her hoarder home with a bloody ice-axe beside her. Now, it's up to the Mounties to track down the killer. (S5, ep 9)
When Florida investigators find a retired Marine dead in his home, their suspect list is his estranged son, a mysterious woman and a possible serial killer. (S5, ep 10)
After Santa Barbara Police find a PhD student shot dead on his doorstep, investigators unravel a cold-blooded family plot that hinges on a single strand of DNA. (S5, ep 11)
After detectives find a popular hairstylist stabbed to death, their suspects include the victim's landlord, her married lover, and an aggressive ex-boyfriend. (S5, ep 12)
Deputies in Tennessee find a beloved Memphis-area basketball coach murdered in his home, leading investigators to look into his closest relationships. (S5, ep 13)