Prisoner: Cell Block H star found guilty of sexually assaulting teenage girl in 1980s

Prisoner: Cell Block H star Maggie Kirkpatrick, who played corrupt warden Joan 'The Freak' Ferguson, has been found guilty of sexually assaulting a young girl in the 1980s.

The 74-year-old actress had denied two charges of indecent assault and one charge of committing an act of gross indecency with a person under the age of 16 at Melbourne Magistrates' Court.

But Magistrate Peter Mealy on Thursday found the complainant was a "witness of truth".

In a statement read to the court, the unnamed victim said she had organised a meeting with Kirkpatrick through a TV producer while she was a patient in a psychiatric hospital in 1984.

The court had earlier been told the victim had not reported the abuse until 2013 because she thought everyone would think she was crazy.

Kirkpatrick collected the girl from the hospital and then the pair went back to the actor's home and shared a meal.

The pair then ended up in Kirkpatrick's bedroom before the girl was taken back to the hospital.

Kirkpatrick told police the charges were "false and malicious". In a recorded interview with officers shown in court, she said she had taken the girl home for dinner but did not abuse her.

She said she was giving the teenager "a day out" in an act of "kindness".

A high school friend of the victim told the hearing that the girl was a "big fan" of the TV show at the time.

Prisoner: Cell Block H ran from 1979 to 1986 and starred Kirkpatrick as the violent Ferguson, who would molest inmates under the pretense of carrying out body searches.

Kirkpatrick, who went on to star in a number of other Australian TV shows as well as playing a part in stage show Wicked, has previously spoken out to deny the claims.