And then there's the Beatles song "Doctor Robert," a tribute to Dr. Robert Freymann, a Manhattan physician "known to New York's artists and wealthier citizens for his vitamin B-12 injections, which also featured liberal doses of amphetamine," according to Wikipedia. He signed Charlie Parker's death certificate, according to the same source.
Couldn't drag Dr Jack Kevorkian's name up out of my memory, partly because as an Australian, I'm far more familiar with Dr Philip Nitschke in that context. Perhaps, given his international prominence as the first doctor to legally assist a suicide, Nitschke could also be accepted as a valid answer.
https://en.wikipedia.org/wiki/Philip_Nitschke