He’s apparently still aground. If you type Larry Grathwohl and Bill Ayers into Google, all kinds of stuff comes up.
To anyone who missed the sympathetic documentary, there may be something of reference in here;
Extensive archival material, including, photographs, film footage and FBI documents are interwoven with modern-day interviews to trace the group’s path, from its pitched battles with police on Chicago’s streets, to its bombing of the U.S. Capitol, to its successful endeavor breaking acid-guru Timothy Leary out of prison.