August sentencing hearing for man guilty of sex assaults outside of Calgary
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CALGARY – A man who was found guilty this week of sexually assaulting three vulnerable women, and drugging one of them, at a rural home east of Calgary will be back for a sentencing hearing in August.
Richard Robert Mantha, 62, was convicted of six offences: two counts of sexual assault, choking while committing a sexual assault, administering a noxious substance, assault with a weapon, and uttering threats against a fourth woman.
Other charges against him were dismissed.
Mantha, who initially faced 20 charges, was accused of attacking seven women between August 2019 and April 2023.
Charges involving the seventh complainant were earlier dismissed, because she died before the trial.
Court heard most of the women worked in Calgary’s sex trade.
A sentencing hearing has been scheduled for August 18.
This report by The Canadian Press was first published April 10, 2026.