“Mrs Diskin says: "The trial should never have taken place. I sat there during the trial and listened to it and there is nothing to connect him with (the murder)."
She tells the programme that knowing her brother the way she does, he could not be guilty.
"Everyone who knows Barry knows he is gentle and respectful.
"I've never seen anything in him to suggest he could murder someone. To kill you need to be cold - Barry is warm."
Mrs Diskin also tells the programme that although George was "vulnerable", his "eccentricity" was looked upon fondly by many of the residents in Fulham, where he lived in Crookham Road just 500 metres from Miss Dando's home.
"Barry was the local character in the street for the people of Fulham. It may have been that Barry sometimes bugged them (but) he loved talking to people.
"He (sometimes) wouldn't understand that someone would be trying to get to work, but many people were quite comfortable to chat (to him) for long periods.
"(Barry) didn't have a job, so he liked to stop and chat to people, and go in and out of shops. People thought he was 'different', but different doesn't equal 'murderer'.
"Barry liked to be liked," she says.
Asked by the programme whether she agreed that George's behaviour - which included adopting new names for himself and wearing combat clothing - was harmless eccentricity, Mrs Diskin says it was "very, very childish" and made him vulnerable.
She says George should have been better protected by the health system.
"Barry lived alone but there was never anyone to check that he was OK. He should have been monitored," she says.
Asked about her brother's previous convictions, Mrs Diskin says she believes the exposure they have been given and the way they were portrayed had been taken out of context."Only these things (have received attention). The views of the people who liked (Barry) have been glossed over. It wasn't in the media's interest to put these things forward," she says.
"Yes, he's made mistakes, but not everyone has their whole life laid out to look at and judge.
https://www.dailymail.co.uk/news/article-58143/Wrong-man-convicted-Dando-killing-says-sister.html