The actress played Patrick Dempsey's love interest in the popular 1987 film
Credit: Everett

Amanda Peterson, who starred opposite Patrick Dempsey in the 1987 movie Can’t Buy Me Love, has died at the age of 43.

The actress, who played Cindy Mancini in the teen film, was found dead in her Greeley, Colorado, home on Sunday, PEOPLE confirms.

“We were advised by the reporting party that they had attempted to make contact with Amanda when she didn’t show up for an arranged meeting,” Joseph Tymkowych, of the Greeley Police Department, tells PEOPLE.

After no response at the actress’s door upon arrival, investigators entered and found her dead inside the residence.

The official cause of death is not yet known, but Peterson’s mother, Sylvia, tells PEOPLE it may have been related to her sleep apnea.

“She was in bed, and she’d had a wonderful day, and we were planning on a dinner the next day, so it was just a very, very big surprise,” Sylvia says.

Peterson’s last film appearance was in 1994’s Windrunner. She is survived by second husband David Hartley and two children and was one of three children born to Sylvia and Dr. James Peterson.

Numerous celebrities have reacted on social media after learning of her death.

Sarah Michelle Gellar Tweeted on Monday, writing, “When I was younger, I used to want to be #AmandaPeterson. I even asked my mom for a white leather fringe jacket #RipAmandaPeterson.”

“Cindy Mancini was my first crush,” Donald Faison wrote on his Twitter. “RIP Amanda Peterson.”

Others who have spoken out include Scott Foley, Michael Rosenbaum, Will Friedle, Neil Patrick Harris, Dane Cook, Meredith Salenger (a fellow orphan in the 1982 version of Annie alongside Peterson) and Lance Bass.

Reporting by EMILY ZAUZMER