Michael Jackson's longtime physician and rumoured sperm donor has passed away in California.

Dr. Arnold Klein, who was Jackson's dermatologist, was pronounced dead shortly before 8pm on Thursday night. Klein, was 70-years-old, was also suffering from Multiple Sclerosis and confined to a wheelchair at the time of his death.

Dr. Klein was admitted to the hospital four days ago suffering severe abdominal pains according to TMZ. He remained in the hospital until he died Thursday evening. He was pronounced dead, of
natural causes, at 7:50 PM.

Klein, a renowned Beverly Hills dermatologist, had an astonishing fall from grace. He was at one time Hollywood's biggest dermatologist, but that all changed following Michael's death when he came under fire for his treatment of the pop star and began speaking publicly about the singer's personal life.

Dr. Klein also strongly hinted on multiple occasions that he was the biological father of Michael's two oldest children, Prince and Paris. In 2013, he posted a photo of himself and Prince Jackson on Facebook implying that he was the biological father of Michael's oldest son.

Michael met the biological mother of Prince, Debbie Rowe, through Dr. Klein because she was his medical assistant.

Coincidentally, Prince actually addressed these rumors just hours before Dr. Klein's death on Twitter when someone wrote that he was not a Jackson but rather a Rowe-Klein. He responded by  essentially saying he knew Michael was not his biological dad, but it didn't matter to him.

'The blood of the covenant is thicker than the water of the womb ... I was raised by my dad with my brother and sister.'

Dr. Klein was not Prince's father either.