MICHAEL Jackson’s final bodyguard has revealed the hidden torment which he believes played a major part in killing the ‘King of Pop’ at the age of just 50.

Bill Whitfield said Jackson – who would have turned 66 today – had become “frail” in the weeks before his death in 2009.

Celebrity security pro Bill became Jackson’s bodyguard in December 2006 – not long after he had been cleared of shocking child sex abuse allegations.

He said he had read stories about the case and took the job unsure in his own mind about whether the allegations could be true.

Bill told The Sun: “He was sad a lot. Things were different, he had just come off facing a couple of trials.

“Like everybody, I heard all the stories prior to working for him, so it would only be normal for me to go into the situation wondering.