A detective turned university professor helped police bring Nikki Allan's killer to justice, more than 30 years on from his horrific crime.
David Boyd, 55, was jailed for life this week for murdering the seven-year-old in Sunderland in 1992.
Investigations expert Gary Shaw, who has advised in some of the UK’s most high-profile crimes, was called in to share his expertise with police officers interviewing Boyd following his arrest in 2018.
