Celebrity make-up artist Christiane Lange, the live-in lover of John Clark Gable, was discovered unresponsive at their Malibu home on Wednesday afternoon (11Apr12).
Homicide detectives were called to the scene and investigators have now launched a probe into the 41 year old's passing.
A cause of death has not yet been determined but officials do not suspect foul play, according to E! News.
Los Angeles County Chief Coroner Ed Winters says, "It could be a natural (death). It was reported as possible prescriptions. She takes a couple of meds (medications). It may have been a heart attack. There is no indication of foul play or obvious trauma."