Conversation so far:
what ddid Gerry Mulligan do for the last few years?
until the end of his life, Mulligan maintained an active career performing and recording jazz - usually with a quartet that included a piano.
what did he record?
Re-Birth of the Cool (released in 1992) featured the charts from Birth of the Cool.
whaat hits were on that album?
CANNOTANSWER.
what other albums did he record?
Mulligan's final recording was a quartet album (with guests), Dragonfly, recorded in the summer of 1995 and released on the Telarc label.
did he die?
Mulligan died in Darien, Connecticut, on January 20, 1996, at the age of 68.

Question: what did he die of?
Self-contained rewrite: what did Gerry Mulligan die of