Marvin Wilson, a 54-year-old mentally disabled man, was executed on Tuesday night by Texas authorities, even though the Supreme Court has ruled that mentally disabled people cannot be executed.
Wilson, who was executed for a killing a police informant in 1992, was declared dead by lethal injection at 6:27 pm.
The main witness against Wilson was the wife of another man, who was present during the killing and charged with a lesser crime.
The U.S, Supreme Court rejected Wilson's final appeal, just hours before the execution.
According to the American Association of Intellectual and Developmental Disabilities (AAIDD), Wilson was diagnosed with mild mental retardation, with an IQ of 61.
Prior to his execution, Wilson said: “Take me home Jesus. Take me home Lord. I love you all. I’m ready."
In 2002, the U.S. Supreme Court ruled against executing mentally disabled people, but allowed individual states to decide what is "mentally disabled."
According to the Texas state definition, which is based on a passage from John Steinbeck's book 'Of Mice and Men,' Wilson did not suffer from a mental disability.
The human rights group Amnesty International called the decision “highly disturbing."