Robert Lee Yates is a Spokane Washington serial killer who is known to have murdered at least 16 women and possibly more.

One page handwritten letter hand signed, Robert Y. 
Yates has written a PS on the back.
He's filled out a visitation form and hand signed, Robert Lee Yates Jr.

Includes the prison issued envelope completely penned by Yates and hand signed, Robert L. Yates.
Includes a handwritten quote written by Yates on the back of the envelope.