Richard Robert Mantha, 59, is already facing 16 charges, which also include sexual assault causing bodily harm and administering a noxious substance.
On Friday, the Calgary police laid two additional counts of sexual assault and two additional counts of administering a noxious substance, bringing the total to 20 charges involving five different victims.Police said the investigation is ongoing and they encourage anyone who has been a victim of sexual assault to report it to their local police station.
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