Martha Johnson is an American female and suspected serial killer convicted of murdering one of her children and suspected of killing her other three children. She later admitted to killing a second child, but denied killing the other two. Johnson was released from prison in 2020. 8 1/2" x 11" two page handwritten letter hand dated January 31, 2012, hand signed, Martha Johnson. Includes the prison stamped envelope postmarked 2012 completely written by Martha, hand signed, Martha Johnson.