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A now-former board member of the Calgary Homeless Foundation is facing serious charges, accused of sexually assaulting and drugging a teenage boy and attacking another young man with a knife.

Robin Adair Wortman, 62, has been charged with sexual assault and assault with a weapon, as well as two counts of communication to procure sexual services from victims under the age of 18. Investigators said he did not have any past dealings with police.

Wortman had been a member of the volunteer board of the Calgary Homeless Foundation for seven years. When news of his arrest reached the organization Monday, an emergency meeting was called and Wortman was removed from the board, “subject to the final court disposition.”

Watch below: Calgary Police Staff Sgt. Melanie Oncescu issues a statement after a man was accused of sexually assaulting and drugging a teenage boy.

1:21 Calgary police charge man with sexually assaulting, drugging teen and chasing another with a knife Calgary police charge man with sexually assaulting, drugging teen and chasing another with a knife

A statement from the foundation said the board has no direct contact with clients.

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“We have no knowledge of the scenario or the allegations, but we have 100 per cent confidence and trust in the leadership and the due diligence of the Calgary Police Service and the court,” Calgary Homeless Foundation president and CEO Diana Krescy said.

“We honour when somebody comes forward and speaks up; we’ve got to put our strength behind those vulnerable people.” Tweet This

WATCH: Staff Sgt. Melanie Oncescu explains what police consider ‘vulnerable’

0:29 Calgary police on what they consider ‘vulnerable’ Calgary police on what they consider ‘vulnerable’

Wortman was arrested on March 12 at an apartment in the 1000 block of 16 Avenue S.W. in connection with another incident, in which a 19-year-old was chased out of an apartment with a knife. The teen was unharmed.

Police believe the accused targeted vulnerable teens in particular.

“I would identify someone who is vulnerable as perhaps struggling with mental health issues or homelessness or substance abuse… or perhaps they’ve somehow been failed by the support systems one would hope would be available to them,” Staff Sgt. Melanie Oncescu said.

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WATCH: Advocate Sheldon Kennedy explains why it’s so important for victims of sexual abuse to tell their story.

1:28 ‘It’s important to tell your story’: Sheldon Kennedy ‘It’s important to tell your story’: Sheldon Kennedy

Investigators said a 17-year-old came forward to police in January, reporting he had been sexually assaulted.

“The teen accepted what he thought was crystal meth, but it is also believed he was given date-rape drug GHB to incapacitate him before he was sexually assaulted,” police said in a Monday statement.

In such investigations, Oncescu said police are always concerned there may be more victims.

“When we lay the charges of communication to procure a sexual encounter with a person under the age of 18, that’s always a concern that someone is out seeking that,” she said.

His next court appearance is March 15.

Anyone with information is asked to call police at 403-428-5457.

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WATCH: ‘They live a riskier lifestyle’: Sheldon Kennedy on childhood sexual abuse victims

1:01 ‘They live a riskier lifestyle’: Sheldon Kennedy on childhood sexual abuse victims ‘They live a riskier lifestyle’: Sheldon Kennedy on childhood sexual abuse victims

The 17-year-old victim is receiving care at the Sheldon Kennedy Child Advocacy Centre in Calgary.

Kennedy was at the police press conference Monday and commented on the link between child abuse and vulnerable populations.

“If we look at the stats, 72 per cent of people involved in treatment centres disclose early childhood abuse,” he said. “Kids that’ve been abused are 26 times more likely to experience youth homelessness. Kids that are abused are at a 30 per cent higher risk of high school dropout rate. So the impact is real.”

WATCH: Advocate Sheldon Kennedy says one the most misunderstood theories of sexual abuse is the “grooming process”.

1:10 Sheldon Kennedy says ‘grooming process’ misunderstood in sexual abuse cases Sheldon Kennedy says ‘grooming process’ misunderstood in sexual abuse cases

Kennedy suggested one of the most misunderstood theories around child sexual abuse is the grooming process.

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“What did I learn in school? ‘Be careful of the white van that cruises around town because they’re going to get you.’ Well—98 per cent of the kids that come through the child advocacy centre, they know their abuser. Forty-six per cent of them is a parent or caregiver, so ‘stranger danger’ is out the window.”

With files from Global’s Erika Tucker