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Drew Carey's ex-fiancee, Dr. Amie Harwick, has been murdered after cops say an ex-boyfriend attacked her and caused her to fall from a third-story balcony.

Law enforcement sources say they got a call early Saturday morning of a woman screaming in a Hollywood Hills neighborhood. Cops were met in the street by Harwick's roommate, who said she was being assaulted inside her home.

We're told once officers attempted to get inside Harwick's home, they found her unresponsive underneath a third-story balcony, with injuries consistent with a fall. Harwick was taken to a hospital where she later died from her injuries.

Cops say evidence suggested there was forced entry and a struggle inside Harwick's home before she was discovered. Investigators located surveillance footage in the neighborhood and determined the suspect was a white male dressed in black.

Detectives learned Harwick had recently expressed concerns about an ex-boyfriend -- who she once had a restraining order against -- causing her harm. Cops say the restraining order ended just two weeks ago and Harwick had recently seen the ex.

Cops arrested the ex, Gareth Pursehouse, Saturday afternoon and booked him for murder.