Jimmy Savile's former personal assistant, Janet Cope, told ITV's Exposure that although she had never seen him abuse anyone, he was a controlling person.
She added: "I knew how he operated so I was very wary of him and I felt there was an undercurrent, there was a bad side, which not many people saw."
At Stoke Mandeville Hospital, Ms Cope said Savile held a position of real authority, adding: "He controlled everything. He controlled me. Everybody was - I'm going to use the word frightened - of him."
More top news
An animal reserve in Kent is celebrating after the birth of an extremely rare and endangered Malayan tapir.
Mother of three Ashleigh found a way to make her penchant for finding the best deals into a new career after being made redundant.
An Israeli company is pioneering a new technology that it says could charge a mobile in 30 seconds and an electric car in just minutes.