I remember him in The Persuaders as well as Columbo.
He was on F Troop too. Great loss but at 99 definitely a full life
I can't name nearly all the things I know him from. One of them on Friday itself (before finding this out), a comical commercial I just ran into on YouTube.
One thing a lot of people mention is his cartoon career, like playing "Mr. Whoopee" on TENNESSEE TUXEDO.