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Don Knotts portrayed replacement landlord Ralph 'RF' Furley on 'Three's Company,' which ran for eight seasons between 1976 until 1984.
'Three's Company' followed the lives of three single roommates, Jack Tripper (John Ritter), Janet Wood (Joyce DeWitt) and Chrissy Snow (Suzanne Somers), their living arrangement and sexual exploits. At the time of the show's debut in 1976, co-ed living was still somewhat taboo and the trio told the landlord Stanley Roper (Norman Fell) that Jack was gay, while the landlord's wife Helen (Audra Lindley) knew what 'the kids' were doing.
When Somers was written off the show in 1981, her character Chrissy Snow was sent to care for her sick mother in Fresno and was temporarily replaced by Chrissy's cousin Cindy Snow (Jenilee Harrison) before their permanent roommate, Terri Alden (Priscilla Barnes) moved in.
Lindley and Fell went on to star in the spinoff 'The Ropers,' which ran between 1979 and 1980 on ABC, which showed the couple moving from their 'Three's Company' home to live in the fancier Cheviot Hills community and sold the building. The new owner's brother Ralph Furley (Don Knotts) took over as the landlord.
Furley was known for his bright leisure suits and being a self-proclaimed 'ladies' man.'
Knotts was born in 1924 in West Virginia. He was married three times to Kathryn Metz between 1947--1964, to Loralee Czuchna from 1974--1983 and to Frances Yarborough from 2002 until his death.
Knotts is best known for his portrayal if Barney Fife on 'The Andy Griffith Show,' a role which earned him five Emmy Awards.
Knotts received a star on the Hollywood Walk of Fame in 2000. In his final years, he voiced characters in 'Air Buddies,' 'Chicken Little,' Hermie and Friends' and 'Robot Chicken.' He also made cameos on Ritter's show '8 Simple Rules' and on 'Desperate Housewives.'
The actor also portrayed a mysterious TV repair man in the 1998 film 'Pleasantville'
Knott's last television appearance was in an episode of 'That '70s Show,' where he portrayed Fez and Jackie's landlord.
Knotts died on February 24, 2006 at age 81 from pulmonary and respiratory complications to Pneumonia related to lung cancer.
(Pictured: Don Knotts appears in a still from 'Three's Company.' / Don Knotts appears in the recording studio of the 2005 film, 'Chicken Little')
(DLT Entertainment / Walt Disney Productions)