Michael Jackson's close friend Dr. Arnold Klein has passed away at age 70, TMZ reports. The famed dermatologist died Thursday night in Palm Springs after being admitted to the hospital on Monday because of severe abdominal pains.

Klein and the King of Pop were the best of friends, but their friendship was fueled by MJ's drug addiction. Klein would frequently write him prescriptions under aliases and administer him Propofol, the drug that ended up killing him.

After the legendary singer's death, Klein's life spiraled downward and he eventually filed for bankruptcy.

Oddly enough, just yesterday Prince Jackson insinuated that Klein quite possibly could be his biological father. A random Twitter user wrote "everyone knows you are a Rowe-Klein NOT A Jackson!!" so Prince fired back with an oddly telling response.

"The blood of the covenant is thicker than the water of the womb ... I was raised by my dad with my brother and sister," he commented back.

So sad!