George Kearon Joseph Fitzsimmons was born on May 7, 1936, in Cleveland, Ohio. He was the only child of William and Pearl Fitzsimmons. Not much is known about his early childhood. During his teenage years, he dropped out of college. Soon after leaving school, he joined the Army and was stationed in Korea. While in the Army, he became interested in karate and practiced it diligently.

However, during this time, Fitzsimmons developed a problem with amphetamines. This addiction sometimes caused him to act violently and experience mental breakdowns, including auditory hallucinations. His parents were concerned about his well-being. They sent him to Buffalo State Hospital for treatment, where he stayed for a period of time before he was released.

After he got out of the hospital, he worked as a lifeguard at a local YMCA for a while. Eventually, he moved back in with his parents in Eggertsville, New York. In the local community, he became known for his skills in karate and his enthusiasm for weightlifting.

On January 12, 1969, George Fitzsimmons had an argument with his parents about attending church. In a fit of rage, he attacked them with a souvenir tomahawk and karate chops, killing them both. After the murders, he stole his father’s car and fled to Attleboro, Massachusetts. He stayed at a motel there until neighbors reported his parents missing, which led to the discovery of their bodies on January 21. Fitzsimmons traveled to Altamont, Illinois, where he attempted to have money transferred to his bank account. Knowing a warrant was out for his arrest, the bank alerted the police, and he was taken into custody.

After being extradited back to New York, Fitzsimmons faced two counts of murder. His attorneys argued for a reduced charge, but the judge maintained the murder charges. During the trial, Fitzsimmons was found to be a paranoid schizophrenic and was ordered to be placed in the Buffalo State Hospital instead of being convicted of murder.

Less than three years later, he was released after mental health professionals believed he was no longer a danger to society. Soon after, he and his wife moved to Coudersport, Pennsylvania. Just weeks after their move, Fitzsimmons assaulted his wife, leading to her hospitalization. He was charged with simple assault since she did not want to press further charges.

Fitzsimmons later moved in with his elderly aunt and uncle in Roulette, Pennsylvania. His mental health continued to decline, and he became convinced that they were poisoning him. In a confrontation, he stabbed his uncle DeAlton twice in the heart and then killed his aunt Euphresia. After the murders, Fitzsimmons drove to a sandwich shop in Buffalo and called his lawyer to confess. He waited for the police to arrive and take him into custody.

Two days after his arrest, he was officially charged with the murders of his aunt and uncle. His wife filed for divorce soon after. Fitzsimmons used his inheritance to hire famous attorney F. Lee Bailey, who sought to change the trial's location to a larger area. The trial ultimately took place in Greensburg, Pennsylvania, where psychiatric experts testified regarding Fitzsimmons' mental health.

During the trial, Fitzsimmons disputed the insanity defense, claiming he was not mentally ill. However, evidence, including a recorded confession, contradicted his claims. Despite the defense's efforts, he was found guilty and sentenced to two life terms in prison. He was sent to the State Correctional Institution – Dallas in Pennsylvania.

In prison, Fitzsimmons was initially troublesome but later became isolated, often talking to himself. He remained there until his death from cancer in 1999.