Mulaney recalled how Michaels invokedJohn Belushi, who died in 1982 at 33 after struggling with addiction.
While in rehab, Mulaney received a call from Michaels.
He goes, I knew John Belushi for seven years.
John MulaneyKevin Winter/Getty Images
Belushi died from a combination of cocaine and heroin during a days-long drug binge.
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And [Michaels] goes, You know, John didnt want to die.
You know, he didnt plan to.
Mulaney checked into rehab in December 2020.
But Mulaney revealed to Letterman that he tried to leave rehab early after only four days at the facility.
Thats when a doctor made a comment that stuck.
He didnt argue or anything.
He just went, John.
We both know how this movie ends.
And that was it, Mulaney said.
I just kind of nodded and went back to my room and stayed.
