Aileen Carol Wuornos was a female serial killer who was executed via lethal injection by the state of Florida on October 9, 2002. 

Handwritten letter to Wuornos hand signed by the sender, Christy.
Includes the original mailing envelope in what appears to be Christy's handwriting addressed to Wuornos on death row.
The envelope is postmarked from Zanesville, Ohio 7 days before Wournos was executed.