Robert Diaz deceased nurse / serial killer who murdered at least 12 of his patients.
Diaz died in August 2010 while awaiting execution.

Christmas card mailed from San Quentin's death row while Diaz was awaiting execution.
Diaz has written a message which completely fills the inside of the card and hand signed, Bob Diaz. 
Includes the original prison stamped mailing envelope signed, Robert R. Diaz.