Starsky & Hutch (1975)

Season 3: Episode 11

A calculating criminal bumps off a loan-shark's collector and takes over the role, collecting debts for the head of the money-loaning racket – a washed-up former child star. The Detective pals investigate, only for it to turn out that the father of Hutch's girl-friend is one of the people owing money to the crooked racket, and that the vicious new collector is actually a notorious killer with an ulterior motive...