Mandy Blank -- one of the most famous female fitness competitors ever -- died this week at the age of 42, TMZ Sports has confirmed.
Law enforcement sources tell us ... the former IFBB World Champion was discovered by a housekeeper in the bathtub of her L.A home on October 29.
The housekeeper called 911 and paramedics raced to the scene -- where she was pronounced dead.
Our sources say no drugs or alcohol were found at the scene and there's nothing criminally suspicious about her death. We're told the plan was to conduct an autopsy and toxicology to determine an exact cause of death.