The producer passed away on Friday (03Aug12) following a battle with cancer, although no further details were available as WENN went to press.
Martin broke the news to fans on Twitter.com, writing, "RIP my friend, partner, Tony winner, Joan Stein. Wit, too."
Stein worked on over 80 plays and musicals throughout her career, including Broadway productions The Nerd, The Elephant Man, The Lonesome West and 1998's Side Man, which won her a Tony Award.
She also worked on hit musical Catch Me If You Can, based on the 2002 Leonardo DiCaprio movie of the same name, and co-owned TV company Martin/Stein Productions with the Bowfinger comedian.