Marvin Gayle Gray (born August 7, 1954 in Princeton, Kentucky – July 23, 2013 in Cañon City, Colorado) was an American murderer and suspected serial killer who gained fame in the 2000s due to his deviant behavior.
Being a powerlifter, Gray, while imprisoned, achieved incredible results in powerlifting, almost breaking world records.
Since 1992, relying on his physical strength, he committed several rapes and murders of fellow inmates, which resulted in taking exceptional measures against Gray by putting him in a high-secutiry prison's solitary confinement cell, restriction of movement within the prison and others.
In the 2000s, he was considered the most dangerous prisoner in the state of Colorado, being convicted of 3 murders and suspected in several others, personally confessing to killing 41 people across 8 different states from 1971 to 1992.
However, the credibility of his testimony continued to be disputed until his death.