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Alberta man gets 12-year sentence for sexual assaults on vulnerable women

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Cite

Graveland, B. (2026, September 17). Alberta man gets 12-year sentence for sexual assaults on vulnerable women. The Globe and Mail. https://www.theglobeandmail.com/canada/alberta/article-alberta-man-gets-12-year-sentence-for-sexual-assaults-on-vulnerable/

Dated when The Aporia collected the article, usually within hours of publication. Check the original for its exact date and byline.

The Globe and Mail · collected 2026-09-17 · by Bill Graveland
Content note This article describes sexual violence.

Quick Summary

Richard Robert Mantha, 62, has been sentenced to 12 years in prison for sexual assaults and threats against vulnerable women at his rural home near Calgary between 2019 and 2023. He was convicted of six offences including drugging one victim and laughing as another fled in terror. The court heard testimony from Aimee Ert, who forgave Mantha but said she would never forget the trauma he inflicted upon her.
Written by AI on 2026-09-17, from this article's own text only (the story summary below draws on all the coverage).

AI analysis

Story summary

Richard Robert Mantha, 62, from Calgary, received a 12-year prison sentence for sexually assaulting vulnerable women at his rural property near Chestermere between 2019 and 2023. The judge sentenced him to six years less than five years and three months credit for time already served, leaving Mantha with about seven more years in prison. He was convicted of six offences: three sexual assaults, one involving drugging a victim, and uttering threats against another woman. Justice Judith Shriar noted that Mantha showed "callous disrespect" by laughing when a terrified victim fled his property. The trial faced delays due to Mantha firing previous lawyers and having health issues like a stroke. One victim, Aimee Ert, testified about being drugged, choked, and sexually assaulted after agreeing to go with Mantha to his acreage.

Written for “Alberta Sex Assault Sentencing” on 2026-10-31, grounded in this article and the 3 other(s) covering the same event.

Story

📰 Alberta Sex Assault Sentencing
Crime & Law · 4 article(s) covering the same event. Compare every outlet's account →

Compared with similar articles

This article reads unscored and hedges 0% of its claims. Each row says how that neighbour differs.
Man sentenced to 12 years for Alberta sex attacks Same event
Global News
Hedges 0 of 14 claims Outlet record 63/100
Alberta man sentenced to 12 years in sex assaults Same event
The Globe and Mail
Hedges 0 of 2 claims Outlet record 52/100
Calgary man handed 12-year prison sentence for sexually assaulting 3 vulnerable women Same event
CBC News
Hedges 0 of 11 claims Outlet record 74/100
How this article was measured signals, leaning charts, publisher record, byline, topics and claims

Signals How these are calculated →

Claims extracted
14
sentences that state something as happening or true
Uncertain
0%
0 of 14 hedged ("reportedly", "may", "according to")
Leaning
not political
takes no side on a contested political question
Publisher signals
52/100
The Globe and Mail's corrections and hedging, across everything collected from it. Not a measure of accuracy.
Outlets on this story
4
Crime & Law
Same framing elsewhere
1
articles that frame the event the way this one does
Analyzed 2026-09-17 · how these are computed

How this is being covered How these are calculated →

Article leaning vs. publisher reliability
Source leaning vs. consistency

Publisher

The Globe and Mail · 1022 article(s) · 35 correction(s) detected
Running correction rate · 35 correction(s)
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Who wrote this

Bill Graveland
19 article(s) here · 1 carrying a prediction
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🔮 Albertans are set to vote in a referendum on Oct. 19, and one of the 10 questions asks whether the province should stay in Confederation or if there should be a second, binding referendum on separation.
2026-09-29 · assertive framing · Smith, Ford discuss separation referendum in Calgary
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2026-09-28 · assertive framing · Ontario Premier Doug Ford comes to Calgary, urges Albertans vote to remain in Canada
🔮 The Alberta premier told a virtual assembly discussing the province's future in Canada that a lot of Albertans are angry, but it would be a mistake to separate now that progress is being made with Prime Minister Mark Carney on Sept. 19.
2026-09-20 · assertive framing · Danielle Smith speaks about potential separation
🔮 Smith said even with polls suggesting the remain in Canada vote will win, the number of those voting for separation is “too high for comfort”
2026-09-19 · assertive framing · 'Why walk away?': Emotional Danielle Smith speaks against separation at online forum
🔮 Smith said even with polls suggesting the remain in Canada vote will win, the number of those voting for separation is “too high for comfort.”
2026-09-19 · assertive framing · Smith makes case for Alberta in united Canada ahead of referendum
🔮 However, I will never forget what he did to me.
2026-09-17 · assertive framing · Alberta man gets 12-year sentence for sexual assaults on vulnerable women
🔮 Alberta is set to hold a referendum on Oct. 19 on whether to hold a second vote on leaving Canada.
2026-09-15 · assertive framing · Carney meets with supporters of Alberta’s remain movement on last day of cabinet retreat
🔮 They are set to meet in the city Thursday morning, and Zelensky is to later address a cabinet meeting in the nearby mountain resort town of Banff, Alta.
2026-09-10 · assertive framing · Zelensky arrives in Calgary ahead of Carney meeting
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Also by Bill Graveland
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Nothing else under this byline is closely related to this article, so these are simply their most recent.
All 19 articles by Bill Graveland →

Topics

Calgary

Subjects

Mantha PERSON · 5× Aimee Ert PERSON · 1× Calgary GPE · 1× Judith Shriar PERSON · 1× Manta PERSON · 1× Richard Robert Mantha PERSON · 1×

Narrative

Aimee Ert, who successfully requested the court lift a publication ban on her name, testified she was drugged, choked and sexually assaulted after she agreed to go with Mantha to his acreage.
framing: assertive · carried by 1 article(s) · first seen 2026-09-17
🔮 However, I will never forget what he did to me.
2026-09-17 · The Globe and Mail
Alberta man gets 12-year sentence for sexual assaults on vulnerable women · assertive framing

Claims (14 extracted, 0 hedged)

A judge has sentenced a man to 12 years in prison for a series of sexual assaults on vulnerable women at a rural home near Calgary. asserted
judge → sentence → Calgary
Richard Robert Mantha, 62, was convicted of six offences, including drugging one of his victims, that happened between 2019 and 2023. asserted
that → convict → 2019
He was also found guilty of uttering threats against a fourth woman. asserted
He → find → woman
Court heard most of the victims worked in the sex trade. asserted
most → hear → trade
Justice Judith Shriar says Manta showed “callous disrespect” by laughing as one terrified victim fled his rural property, fearing for her life. asserted
victim → say → life
The judge gave Mantha credit of five years and three months for time he has already served in custody, meaning he has a little less than seven years left to serve. asserted
he → give → years
The Crown had asked for 10 to 13 years in prison, while the defence recommended between five and seven years. asserted
defence → ask → years
The trial, which started in January, 2024, faced several lengthy delays because Mantha fired previous lawyers and had a stroke. asserted
Mantha → start → stroke
One woman told court she’ll never forget what Mantha did to her. asserted
Mantha → tell → her
Aimee Ert, who successfully requested the court lift a publication ban on her name, testified she was drugged, choked and sexually assaulted after she agreed to go with Mantha to his acreage. asserted
she → request → acreage
She was able to escape, and ran from the property partially clothed. asserted
She → escape → property
She told the sentencing hearing last month that she forgives Mantha and hopes he gets the help he needs. “I also am forgiving myself for allowing him to hurt me. asserted
him → tell → me
However, I will never forget what he did to me. asserted
he → forget → me
I have struggled on a daily basis to get through everything that I have experienced in the past,” she said. asserted
she → struggle → past
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