The fifth series, "Donal MacIntyre's UK Killer Evidence" will air on 5 May. This returning series examines key pieces of evidence found at crime scenes that played a pivotal role in solving the cases. Hosted by channel regular, criminologist and investigative journalist Donal MacIntyre, each episode features a new murder case, analysing the critical scientific breakthroughs, clues, and mistakes that shaped the investigation. The series draws on the expertise of police detectives, forensic scientists, and criminal experts to delve into ten cases where crucial evidence led to the conviction of the murderer.