Gascoigne

Inspector Gascoigne was a police detective investigating Chameleon Tours in 1966 on behalf of Samantha Briggs, whose brother, Brian, had disappeared on a Chameleon Tours holiday to Rome.

The Chameleon who took over Spencer's identity shot and killed Gascoigne for getting too close to the truth when he took some postcards from the Chameleon Tours hanger. Polly witnessed the murder and informed the Second Doctor. The Doctor's subsequent investigation exposed the Chameleon threat. (TV: The Faceless Ones)