Conrad Murray felt "entrapped" by Michael Jackson.
The physician - who was found guilty of the involuntary manslaughter of the late singer on Monday – said the 'Thriller' hitmaker was desperate for him to stick by him because he didn't have any other close friends.
Speaking in new documentary 'Michael Jackson and the Doctor: A Fatal Friendship' - which began filming in November 2009, five months after the star's death - Murray said: "I went there to take care of a healthy man, who said he was fine, to just keep surveillance. But once I got in there I was entrapped.
"He had very close acquaintances, but friends he did not have. He told me, 'I've found one friend, which is you'."
Michael died of acute Propofol intoxication in June 2009 with but Murray insists the dose of the anaesthetic which he gave the star the day he died was "inconsequential" and he hadn't mentioned it to the paramedics sent to treat his patient when he was found unconscious because it was such a small dose.
He said: "That’s a very sad reason. Because it was inconsequential – 25 milligrams and the effect’s gone.
“Means nothing. It had no effect. It was not an issue.”
Murray insists he tried to wean Michael off the white-coloured drug, but the singer was "begging" for it by saying he wanted more "milk" to help him sleep.
He added: "He begged and pleaded and said, ‘Please Dr. Conrad, I need some milk so that I can get some sleep. If I don’t get some sleep, everything will go down the drain.’
“He looked to me like the Thriller. He looked that hysterical.”