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*Dr. Conrad Murray, currently serving four years for involuntary manslaughter in Michael Jackson’s death, maintained his innocence and broke into song during an interview with CNN’s Anderson Cooper on Tuesday.

Speaking by phone on “Anderson Cooper 360,” Murray said when his sentence is up, he wants to “motivate people and continue to do selfless acts.” Shortly after, he began singing “The Little Boy That Santa Claus Forgot,” to Cooper’s visible confusion. Murray said the song, popularized by Nat King Cole and others, exemplifies his life story.

“I had no Christmases, I had no toys, I had nothing,” Murray told Cooper. “But as I grew up my heart has been whole. My heart says to help. And all I do is to give.”

Murray also maintained his innocence in Jackson’s death and called it “overwhelming.”

“I am extremely sorry that Michael has passed on. It’s a tremendous loss for me. It’s a burden I’ve been carrying for the longest while,” he said. “It’s a burden I will carry for an indefinite period of time.”

He went on to say he and Jackson were close, and the late singer used him as a sounding board for bad things that had happened in his past. Cooper asked how Murray could in good conscious could give Jackson propofol, the powerful sedative which contributed to his death. The physician admitted to ordering it for Jackson, but said he was trying to wean the pop star off the drug.

“I did not agree with Michael. But Michael felt it was not an issue because he had been exposed to it for years and knew exactly how things worked,” he said. “Michael Jackson was not the kind of person you could just say ‘put it down’ and he’s going to do that.”

Murray also refuted charges that he was strapped for cash and willing to prescribe whatever Jackson wanted in exchange for being paid $150,000 per month during the singer’s planned This Is It tour. Murray said he never had financial troubles and considered himself more interested in humanitarian pursuits than money.

Murray declined to comment on the Jackson family’s lawsuit against AEG Live, which charges that the concert promoter with negligence in his death by employing Murray to be his doctor. AEG says Murray was Jackson’s employee, and therefore it is not liable in the singer’s death. As previously reported, The Jackson v. AEG Live trial began jury selection Tuesday.

Murray has been on lockdown since November 2011.

Watch Murray’s phoner with Anderson below. He starts crooning at 7:23 in the second video.