Daniel Siebert serial killer who died in April 2008 while awaiting execution. Siebert is known to have victims in California, Nevada and Alabama. 

9" x 12" prison stamped envelope postmarked October 2007 just months before Siebert died. This envelope hand signed, Daniel Siebert, with his and the recipient's complete addresses written by Siebert.

Daniel Siebert Signed Envelope