A Facebook selfie was reportedly the key in solving the strangling death of a Canadian teen–as the killer was pictured wearing the belt used in the crime.

According to CBC News, Cheyenne Rose Antoine, 21, (pictured left) was sentenced to seven years Monday for the 2015 strangling death of Brittney Gargol, 18 (pictured right). Though Antoine has taken responsibility for the slaying, she still claims that she doesn’t remember killing her best friend.

Antoine said that she and Gargol went drinking on the night in question and got into an argument. The Saskatoon StarPhoenix reported that a passerby found the teen’s body near a Saskatoon landfill on the morning of March 25.

A two-year investigation cracked wide open when investigators looked at Facebook to create a timeline of events. It was there they discovered a photo, taken hours before the slaying, that showed Antoine wearing a belt identical to the one found next to Gargol’s body, according to CBC News.

“It’s quite remarkable how the police developed this information,” Crown prosecutor Robin Ritter said.

Ritter accused Antoine trying to throw off investigators by posting to Facebook the night of the incident, asking where Gargol was. She also told officers that they went to several bars on the night in question and that Gargol ended up leaving with a man.

“Where are you? Haven’t heard from you. Hope you made it home safe,” she wrote on the victim’s page, according to the StarPhoenix.

A witness also told police that Antoine had drunkenly admitted to hitting Gargol and strangling her.

Originally facing second-degree murder charges, Antoine ultimately pleaded guilty to the lesser charge of manslaughter.

“I will never forgive myself. Nothing I say or do will ever bring her back,” Antoine said in a statement issued through her lawyer.

“I am very, very sorry…It shouldn’t have ever happened.”

[Featured Image: Cheyenne Rose Antoine and Brittney Gargol/Facebook]