Actress Cindy Williams, who appeared in such iconic television shows as Laverne & Shirley and Happy Days, has died at 75.

Williams died Monday after a short illness, according to CNN. Williams, who began her television career in the late 1960s, is best known for her role as Shirley Feeney in the ABC comedy series Laverne & Shirley. Williams’s character first appeared on ABC’s Happy Days before she joined the late Penny Marshall in spinoff Laverne & Shirley, which ran from 1976 to 1983.

Williams also appeared in such TV shows as For Your Love, 7th Heaven, Law & Order: Special Victims Unit, Girlfriends and Sam & Cat — where she reunited with Marshall in a guest starring role — over her more than six-decade career. 

On film, Williams starred in the 1973 Academy Award-nominated film American Graffiti and 1974’s The Conversation. 

Several celebrities took to social media to remember the actress.

TV and film writer, producer and director Garry Marshall died Tuesday (July 19) at the age of 81.

Marshall’s work in television included creating and producing the original The Odd Couple (1970-75), Happy Days (1974-84), Laverne & Shirley (1976-83) -- starring sister Penny Marshall -- and Mork & Mindy (1978-82), which introduced audiences to late comedian Robin Williams.

Most recently in TV, Marshall served as an executive consultant on CBS's reboot of The Odd Couple, in which he also played Oscar Madison’s father.

Related:Garry Marshall Enters the New Era of TV Comedy: A 2013 Q&A

Marshall directed several films as well, including Pretty Woman, Beaches, Runaway Bride and The Princess Diaries.

Read more, including Twitter tributes, at broadcastingcable.com.