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.
Blank was a legend in the bodybuilding and fitness world -- winning the IFBB World Championships in 1999, the youngest competitor to ever do it at the time.
She also placed 5th in the 1998 World Arnold Classic and was later honored by Bodybuilding and Fitness magazine as having the "Greatest Glutes of All Time," according to her website.
Mandy went on to become a major celebrity fitness trainer and listed clients from Marcus Allen to Mickey Rourke, Alex Rodriguez, Pauly Shore, Rohan Marley and Natasha Lyonne.