Williams was best known for her role on Laverne & Shirley, which ran from 1976 to 1983 and was one of ABC's most popular sitcoms at the time.
The series was born out of an episode of Happy Days in 1975, in which Williams portrayed Shirley and Penny Marshall played Laverne DeFazio. Their characters were so popular, ABC hired the two for their own spin-off show, which debuted on the air the following year.
The show focused on Laverne and Shirley, two roommates that struggled to make ends meet while trying to find Mr. Right.
The pair were one of the best-known duos on television, but the costars also formed a close bond that extended beyond the cameras — and they often spoke about that special connection.
Marshall even spoke so highly of Williams as to place her as the more talented one in their famed collaboration: "[Williams] is a better actress than me. Trust me," she said. "She has a better range. She can [memorize] a paragraph. I can't do an accent."