Peterson became a star after playing Dempsey's romantic counterpart Cindy Mancini in the hit '80s makeover movie, but left the industry just a few years later. She had been living in Colorado for several years.
'Can't Buy Me Love' star Amanda Peterson dies at 43
CAN'T BUY ME LOVE (1987) PATRICK DEMPSEY, AMANDA PETERSON CBM 001
CAN'T BUY ME LOVE (1987) PATRICK DEMPSEY, AMANDA PETERSON CBM 008
CAN'T BUY ME LOVE (1987) PATRICK DEMPSEY, AMANDA PETERSON CBM 005
CAN'T BUY ME LOVE (1987) AMANDA PETERSON CBM 002FOH
EXPLORERS (1985) ETHAN HAWKE, JASON PRESSON, RIVER PHOENIX, AMANDA PETERSON JOE DANTE (DIR) 005
A YEAR IN THE LIFE (MINISERIES) -- Pictured: (back l-r) David Oliver as Sam Gardner, Julie Ronnie as Lisa, (middle row l-r) Morgan Stevens as Jack Gardner, Adam Arkin as Jim Eisenberg, Jayne Atkinson as Lindley Gardner Eisenberg, Eva Marie Saint as Ruth Gardner, Richard Kiley as Joe Gardner, Wendy Phillips as Anne Gardner Maxwell, Scott Paulin as Glen Maxwell (front row l-r) Amanda Peterson as Sunny Sisk, Trey Ames as David Sisk -- (Photo by: Paul Drinkwater/NBC/NBCU Photo Bank)
A YEAR IN THE LIFE (SERIES) -- 'Things You Should Know Before and After' Episode 102 -- Pictured: Amanda Peterson as Sunny Sisk -- (Photo by: Ron Batzdorff/NBC/NBCU Photo Bank)
CIRCA 1989: Actress Amanda Peterson and actor Christopher Atkins on the set of the Columbia Pictures movie 'Listen to Me' circa 1989. (Photo by Michael Ochs Archives/Getty Images)
BEVERLY HILLS, CA - MAY 3: Amanda Peterson attends the premiere of 'Listen To Me' on May 3, 1989 at the Academy Theater in Beverly Hills, California. (Photo by Ron Galella, Ltd./WireImage)
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Peterson's mother told ET that a basic toxicology test had been conducted on her daughter, but that the family was waiting on further reports to see if Peterson had any other medical conditions that may have contributed to or caused her death. She added that "this was not, in any way, a drug thing."