If you got to see Dyan Cannon as Rosemary....

Kallman and Cannon in How to Succeed.

How did he die?

From OP's link:

[quote]Kallman had from youth exhibited an appreciation of fine antique furnishings and an acumen for business.[1] Kallman formed a music publishing company in 1966.[3] By the late 1970s, he had retired from show business and was a wealthy antiques and art dealer and living with Stephen Szladek, his life partner, in a Manhattan apartment.

[quote]Kallman and Szladek were murdered by three intruders in 1980 during a robbery of the art, antiques and jewelry in their apartment.[7][8][9] The killers later were caught and convicted.[8]

I'm old enough to remember his short-lived television series "Hank".

I wish we could have a full-blown thread on Dick Kallman. He was so handsome and sexy - and gay. He appears in this video, dancing to the right of Michelle Phillips as she sings, with a brief close-up of him at 1:42.