Tragic update in search for missing Harvard woman Mary Anderson as body found in truck after ‘fake Instagram posts’

Mary's family reported her missing on Sunday evening after she didn't return home from seeing her friends.

Friends and family then began to worry that she was with an ex-boyfriend, adding that there were strange social media posts on fake accounts under Mary's name last week.

"She had some weird stuff going on with her and accounts that I know was not her posting directly," her friend Abagail told .

Police are now trying to locate and speak with Mary's ex-boyfriend, Matthew Davis, 34, as they believe he may have information relevant to the investigation.

Davis is described as a white male, around 5 foot 6, with brown hair and blue eyes.

Anyone with information on Davis’s whereabouts should call their local police department or the Vermont State Police in Westminster at 802-722-4600.

Mary's mother, Sheila, previously explained that her daughter was supposed to be driving home on Saturday night after spending time with her friends.

She said that the family constantly updates one another on their whereabouts, so knew something was wrong when Mary didn't come home that night.

“This is not my daughter’s behavior. She is missing. She didn’t as a 23-year-old say, ‘Hey, I’m going to leave my life and my family.’ That’s not what’s happening here. She’s missing and I’m hoping Mary will come back,” she told .

A medical examiner is expected to perform an autopsy to determine the cause and manner of the young woman's death.