Susan Atkins aka Sadie Mae Glutz was a convicted murderer and member of the Charles Manson Family. Atkins was convicted of eight murders including that of actress Sharon Tate. Originally sentenced to death, her sentence was commuted in life in prison when the Supreme Court briefly overturned the death penalty.  Atkins died of brain cancer on September 24, 2009.

8 1/2" x 11" one page handwritten letter dated September 21, 1987 written to someone that Atkins apparently offended. She writes about her having feelings and that they will discuss this further at an upcoming visit. 
Hand signed at the close, Susan.
Includes the original mailing envelope completely written by Atkins and hand signed, Susan Atkins.

Susan Atkins Handwritten Letter and Envelope Set Both Signed