Mark Rowntree who now goes by Mark King (not the first time he changd his name) is a British spree/serial killer who committed four random murders in Bingley West Yorkshire in 1975 and 1976. 
 
Two page handwritten letter hand signed twice. Hand signed at the top of the first page, Mark King, with his return address. Hand signed at the close, Mark.
Includes the original mailing envelope.