Stateside actor Finn, who featured in popular television series such as "Friends", Seinfeld and The Middle, has died aged 60.
The comedy and improvisation performer died at home in LA on Monday having undergone treatment for a cancer diagnosis from 2022 onward, according to reports.
"Pat saw everyone as a friend - solely future friends he hadn't encountered," his relatives stated in a statement.
They noted that he had "embraced life completely - with happiness and energy".
Finn's first television role was on a show starring George Wendt in 1995, where he played the brother of the main character.
He subsequently landed a recurring role on "Murphy Brown" from 1995 to 1997.
He starred as the character Joe Mayo in Seinfeld in 1998, portraying a social organizer famous for delegating unpleasant chores to his guests.
During the end of the 90s and start of the 2000s, he had guest spots on a variety of hit series, like:
He was most recognized for portraying Bill Norwood in "The Middle", appearing throughout eight series over nearly a decade.
His work in movies are It's Complicated and "Santa Paws 2".
Beyond his television work, Finn was a skilled improviser and served as an educator at the Colorado university, where he was a faculty member.
He was a member of a six-member improv team known as Beer Shark Mice.
"Finn guided, supported, and advised numerous pupils during his career and you'd be hard-pressed to find anyone anyplace who has anything negative to say about him," his family wrote.
Paying homage, colleague and actor Richard Kind said there was "not a more kind, gentle, or funny, down to earth person you could encounter".
"Consistently upbeat, helping you be funnier and better. A great dad, a great guy," Kind wrote on social media.
The actor is survived by his wife Donna, his children, and his parents and siblings.
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