David Carpenter California's reclusive Trailside Killer. 
Four page handwritten letter signed twice. Excellent content in which he discusses his views on the death penalty, a book on his case ( The Sleeping Lady) and a poem he's incorporated into the letter. No envelope.
Signed on the top of the first page, "David J. Carpenter". Signed on the last page, "David".

David Carpenter Four Page Letter With Poem Signed Twice