Luis José Monge (August 21, 1918 – June 2, 1967) was a convicted mass murderer who was executed in the gas chamber at Colorado State Penitentiary in 1967. Monge was the last inmate to be executed before an unofficial moratorium on executions began in the United States in 1972.
Monge, a Denver, Colorado salesman, was a native of Puerto Rico who grew up in New York. He was convicted and sentenced to death for murdering his pregnant wife, Leonarda, and three of the couple's ten children after his wife had discovered his incestuous relationship with one of their daughters. Monge's murder victims were: Leonarda, Alan (aged 6), Vincent (aged 4), and Teresa (11 months old). Immediately after the four murders, Monge called police and admitted his guilt.
He had no prior felony convictions; in 1961, however, he abandoned his family for two months and served a short jail sentence in Louisiana for vagrancy. The alleged motive for the murders was "to prevent exposure of sex crimes committed by defendant with his own children". He beat his wife to death with a steel bar as she slept, stabbed Teresa, choked Vincent, and bludgeoned Alan with the steel bar.
After Monge had pleaded not guilty by reason of insanity, psychiatrists evaluated him and found him to be sane. He then insisted on pleading guilty to first-degree murder. A jury that was convened for the penalty phase of the trial recommended a death sentence, and Monge's conviction and sentence were affirmed on appeal. In January 1966, Governor John Arthur Love suspended all executions in Colorado, pending a referendum on capital punishment by voters. On November 8, 1966, the voters decided to retain the death penalty by a three-to-one margin. In March 1967, Monge attracted national attention when he asked a Denver court to allow him to be hanged at on the front steps of the Denver City and County Building. This request was denied.
The following month, Monge fired his attorneys and directed that no attempts should be made to save his life. He gave up all of his appeals and asked to be executed. Nonetheless, his surviving children appealed for clemency. Doctors again evaluated Monge's mental status and found him mentally competent for execution. A week before his death, Monge shared a final meal with his surviving seven children. On the eve of the execution, some seventy members of the Colorado Council to Abolish Capital Punishment gathered on the steps of the state capitol building in Denver in a rally to protest the execution. On June 2, 1967, Monge was executed at the age of 48 in the state's gas chamber. Upon his death, and according to his wishes, one of Monge's corneas was transplanted to a teenaged reformatory inmate.