TV presenter Esther Rantzen says she is convinced by allegations by former BBC employee Sue Thompson and others that Jimmy Savile abused children.
ITV1 is broadcasting an hour-long documentary about the star, called Exposure: The Other Side of Jimmy Savile, on Wednesday night.
In it, Sue Thompson, who was a newsroom assistant at BBC Leeds, claims she walked in on Jimmy Saville indecently assaulting a teenage girl in his dressing room in the mid 1970s.
After seeing the footage, Esther Rantzen, the founder of ChildLine, said she now felt a degree of guilt for ignoring "gossip" that surrounded the Top of the Pops and Jim'll Fix It presenter.
Rantzen, who began presenting That's Life in 1973, told ITV1: "I feel that we in television in his world in some way colluded with him as a child abuser - because I now believe that's what he was."