Ronald Clark O'Bryan

As their investigation progressed, police learned that Ronald O'Bryan was over US$100,000 (equivalent to about $550,000 in 2021) in debt and had a history of being unable to hold a job. In the ten years preceding the crime, O'Bryan had held 21 jobs. At the time of his arrest, he was suspected of theft at his job at Texas State Optical and was close to being fired. His car was about to be repossessed, he had defaulted on several bank loans, and the family home had been foreclosed on. Police discovered that O'Bryan had taken out life insurance policies on his children in the months preceding Timothy's death. In January 1974, he had taken out $10,000 (equivalent to $54,946 in 2021) life insurance policies on both of his children. One month before Timothy's death, O'Bryan took out additional $20,000 policies on both children, despite the objections of his life insurance agency. In the days preceding Timothy's death, O'Bryan had taken out yet another $20,000 policy on each child. The various policies totaled approximately $60,000. O'Bryan's wife maintained that she did not know about the insurance policies on her children's lives. Police also learned that on the morning after Timothy's death, O'Bryan had called his insurance company to inquire about collecting the policies he had taken out on his son. After learning that O'Bryan had visited a chemical supply store in Houston to buy cyanide shortly before Halloween 1974 (he left without purchasing anything after learning the smallest amount available to purchase was five pounds), police began to suspect that Ronald O'Bryan had laced the candies with poison in an effort to kill his children to collect on their life insurance policies. They believed he gave the other children poisoned candy in an effort to cover up his crime. Police repeatedly questioned O'Bryan but he maintained his innocence.

O'Bryan's first execution date was set for August 8, 1980. His attorney successfully petitioned for a stay of execution. A second date was scheduled for May 25, 1982. That date was also postponed. Judge Michael McSpadden scheduled a third execution date for October 31, 1982, the eighth anniversary of the crime, and he offered to personally drive O'Bryan to the death chamber. It was to have been the first time Texas executed an inmate by lethal injection. The Supreme Court delayed the date yet again to give O'Bryan a chance to pursue an appeal to seek a new trial. A fourth date was scheduled for March 31, 1984. O'Bryan's lawyer sought a fourth stay on the basis that lethal injection was a "cruel and unusual punishment". On March 28, a federal judge rejected the request. On March 31, 1984, shortly after midnight, O'Bryan was executed by lethal injection at the Huntsville Unit. His last meal consisted of T-bone steak (medium to well done), french fries and ketchup, whole kernel corn, sweet peas, lettuce and tomato salad with egg and french dressing, iced tea, sweetener, saltines, Boston cream pie, and rolls.

On June 3, 1975, a jury took 46 minutes to find O'Bryan guilty of capital murder and four counts of attempted murder. The jury took 71 minutes to sentence him to death by electrocution. Shortly after he was convicted, his wife filed for divorce. She later remarried and her new husband adopted her daughter Elizabeth.

On October 31, 1974, O'Bryan took his two children trick-or-treating in a Pasadena, Texas, neighborhood. O'Bryan's neighbor and his two children accompanied them. After visiting a home where the occupant failed to answer the door, the children grew impatient and ran ahead to the next home while O'Bryan stayed behind. He eventually caught up with the group and produced five 21-inch (530 mm) Pixy Stix, which he would later claim he was given from the occupant of the house that had not answered the door. At the end of the evening, O'Bryan gave each of his neighbor's two children a Pixy Stix and one each to Timothy and Elizabeth. Upon returning home, O'Bryan gave the fifth Pixy Stix to a 10-year-old boy whom he recognized from his church.

Although police never discovered when or where O'Bryan bought the poison, he was arrested for Timothy's murder on November 5, 1974. He was indicted on one count of capital murder and four counts of attempted murder. O'Bryan entered a plea of not guilty to all five counts. O'Bryan's trial began in Houston on May 5, 1975. During the trial, a chemist who was acquainted with O'Bryan testified that in summer 1973, O'Bryan contacted him asking about cyanide and how much would be fatal. A chemical supply salesman also testified that O'Bryan had asked him how to purchase cyanide. Friends and co-workers testified that in the months before Timothy's death, O'Bryan showed an "unusual interest" in cyanide and spoke about how much it would take to kill a person. O'Bryan's sister-in-law and brother-in-law testified that on the day of Timothy's funeral, he spoke of using the money from Timothy's insurance policy to take a long vacation and buy other items. As well, his wife rejected the claim that Timothy chose the Pixy Stix, stating that O'Bryan had, in fact, forced him to choose the Stix. O'Bryan continued to maintain his innocence. His defense mainly drew upon the decades-old urban legend concerning a "mad poisoner" who hands out Halloween candy laced with poison or needles or candy apples with razor blades inserted. These stories have persisted despite the fact that there are no documented instances of strangers poisoning Halloween candy.

O'Bryan lived with his wife, Daynene, in Deer Park, Texas, with their son Timothy and daughter Elizabeth (born 1969). O'Bryan worked as an optician at Texas State Optical in Sharpstown, Houston. He was a deacon at the Second Baptist Church, where he sang in the choir and ran a local bus program.

Ronald Clark O'Bryan (October 19, 1944 – March 31, 1984), nicknamed The Candy Man and The Man Who Killed Halloween, was an American man convicted of killing his eight-year-old son Timothy (April 5, 1966 – October 31, 1974) on Halloween 1974 with a potassium cyanide-laced Pixy Stix that was ostensibly collected during a trick or treat outing. O'Bryan poisoned his son in order to claim life insurance money to ease his own financial troubles, as he was $100,000 in debt. O'Bryan also distributed poisoned candy to his daughter and three other children in an attempt to cover up his crime; however, neither his daughter nor the other children ate the poisoned candy. He was convicted of capital murder in June 1975 and sentenced to death. He was executed by lethal injection in March 1984.