An autopsy has determined Chantel Robertson died of strangulation, the provincial medical examiner said Thursday.

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Chantel Robertson, 20, was last seen alive Saturday morning.

The body of the 20-year old woman, who worked as an escort, was found Monday buried in the yard of the bungalow at which she was last seen.

Robertson was last seen around 2:30 a.m. Saturday when she was dropped off at a client's residence at 98 Street and 80 Avenue in Edmonton's south end.

Matthew Todd Barrett, 24, has been charged with first-degree murder and offering an indignity to a body.

Police began investigating Robertson as a missing person Sunday morning after she did not show up for her scheduled pick-up or for work that day.