Mr. T, whose birth name is Lawrence Tureaud, was listed as one of the notable invited guests for the funeral in California today, which is more than 30 years after he first met Nancy Reagan.
The unlikely friendship between a former bouncer-turned-actor and an actress-turned-first lady started after she asked him to be involved in her drug-prevention program, Just Say No.
But the program itself wasn't the first time they came into contact, according to the 63-year-old actor.
In a series of Tweets he posted after the news of her death, he said he was first invited to the White House by the Reagans in December 1983 and then asked to help her with the Just Say No program.
That December visit was particularly memorable because it resulted in one of the best-known photos of the pair.
"I was one of the wildest Santa Clauses they ever had,” he said in a recent interview. “I had my cut-off sleeves. I had my combat boots on.”
At one point in the night, Nancy Reagan hopped up on his lap and gave him a kiss on the head, lending itself well to a cute photo moment.
They then started to work together in her effort to stop child drug use.