Barry George has said he could not have killed Jill Dando - because he was stalking another woman at the time of the shooting.
On Friday, an Old Bailey jury cleared the 48-year-old of murdering the TV presenter, eight years after he was jailed for the crime.
Detectives investigating the killing became increasingly convinced Mr George was the gunman after they discovered he had followed numerous women and taken thousands of pictures of them.
But in a joint interview with Sky News and the News of the World, Mr George insisted that at the time Miss Dando was murdered, he was following another woman after leaving a disability centre in Fulham.
Miss Dando was shot dead on her doorstep in Fulham, west London, at about 11.30am on April 26 1999.
Between 10.30am and 12.33pm on the day of the shooting, Mr George insisted, he was either at the centre or walking beside the woman.
"I walked with her for a bit and from her perspective, maybe it was unwanted attention. But she didn't make that clear," he said. "It didn't seem like she was telling me to go away. If she'd told me to leave I'd have done so straight away.
"That was at 12.33pm. I know because just a minute before I'd made a call from my mobile to check how much credit I had left."
During three weeks of surveillance before his arrest Mr George was seen to approach 38 women and try to make conversation with them.
He said of his history of stalking: "I know I have done wrong in the past and if I could go back in time and change that I would."
