Apparently, according to his web site in Japanese http://jeremysteig.info/, he passed away.
 
He had been living in Japan for over 20 years after leaving jazz behind to become a visual artist. His passing slipped under the radar, how sad not only for his demise but that wasn't  reported...Wiki shows him still alive
 
Jeremy Steig (September 23, 1942 - April 13, 2016)