An east Toronto family is desperately searching for their missing 15-year-old daughter.

Lily Constant was last seen at 11:30 p.m. on Friday, Nov. 1, in East York, near Woodbine and Holborne avenues.

She is described as five-foot-three with a slim build, blue eyes and long, straight blond hair. Lily, who turned 15 on Oct. 29, was last seen wearing a red zip-up hooded sweater and black track pants, and was carrying a JanSport backpack.

She left without her cellphone or identification and has very little personal effects.

Lily’s father, Lee Constant, along with her mother, Rebecca Marsh, have both been frantically trying to locate their daughter.

“Ultimately, step one, we just want to know she’s OK,” said Constant, who heard about a possible sighting of Lily Thursday morning near Simcoe Street and the Gardiner Expressway and went down to scour that area.

“She’s covering her tracks extremely well.”

Constant said his daughter might have some connections in the Montreal area and could be headed that way.

The family has been using the power of social media and the internet to get the word out about their missing daughter, who attended R.H. McGregor Elementary School and Leaside High School for a short time.

Constant, who is a longtime Torstar employee, said the family especially worried about Lily’s safety as her behaviour started changing “drastically” back in August.

“There was a lot of online activity. She was on her phone constantly chatting and talking,” he said.

“We had an inkling there might be a boyfriend. She wasn’t being very sharing.”

Constant said they believe their daughter may have been chatting online with some older men.

“She stopped going to school. She had contacted all her friends and told them she didn’t want to be friends anymore,” he said, adding Lily even talked about eloping.

“It’s starting to look more and more like luring. It’s a big suspicion … it sounds like she’s under the influence of someone much older.”

At this point, police cannot confirm if Lily was the victim of child luring or sex trafficking. They would only say they’re concerned for her safety.

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Anyone with information is asked to contact police at 416-808-5500 or Crime Stoppers anonymously at 416-222-TIPS (8477).

Editor's note - Dec. 20, 2019: The photograph accompanying this article was removed.