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
Britain's highest court will rule on whether the government requires parliament's approval to get Brexit under way.
New sentencing rules mean serious speeding offences will be met with a 'clear increase in penalty'.
Donald Trump has wasted no time making his mark on international matters as well as domestic. So how will his presidency affect the world?