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A listener's note, the following episode contains course language, adult themes and content of a violent and disturbing nature and may not be suitable for everyone. Listener discretion is advised.

On a cold snowy winter night in January 2008, an officer was on patrol with his partner when a call came in to 911.

The caller said a friend told her that another friend was in trouble. That call was the starting point of a frantic and complicated search for a missing mother of five.

Well, there was no doubt in our mind that she was something horrible was happening to her and we needed to find her right away. We just didn't know where.

The urgency was through the roof, the emotions are through the roof rate. It was very scary and very, you just had this feeling that it wasn't going to end well.

You couldn't in your worst case scenario can never have imagined it would turn out the way it did.

I'm Nancy Hicks, a senior crime reporter for Global News. Today on Crime Beat, a story that's haunted an officer for nearly 15 years after it first unfolded.

I need to warn you details of this case are extremely disturbing and include a violent sexual assault. This is a prayer for our selling.

January 17, 2008 was an especially frigid night in Calgary, the kind of night that makes people want to stay cozy at home.

But for Constable Russ Williamson duty called like it was freezing outside. I remember that it was a really light snow. Obviously it's mid January.

I want to say it was at least minus 30 degrees outside. It was very, very cold evening.

Williamson is a veteran detective with the Calgary Police Service. But in 2008 he was working as a senior patrol officer.

I was working night shift at that time we called him 2100 which basically worked in a 9 at night until 7 in the morning.

It was a pretty normal shift like that area of the city can be pretty busy. And I know my partner and I we had an arrest that we had taken down to the arrest processing unit.

We had just taken a prisoner down there and had admitted a man and we were leaving. And when we were leaving I remember there was this call that was up on the board of my partner and I were driving together.

We were in our police vehicle and I saw it and it was in a different zone. And when you work in police there's different zones within each district that you cover.

Our sign zone we are responsible for all calls, priority calls, mid-level priority calls and then ones that are just basically paperwork calls.

This was kind of a mid-priority call how it came in. It was just something unusual and unique about it. And so we asked the dispatch officer to send it to us.

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