People convicted of murder by Texas

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.

José Ernesto Medellín Rojas (March 4, 1975 – August 5, 2008), born in Nuevo Laredo, Tamaulipas, was a Mexican national who was executed by lethal injection for the murders of Jennifer Ertman and Elizabeth Peña in Houston, Texas.
Medellín was convicted of raping and killing 16-year-old Peña and 14-year-old Ertman in June 1993.His case gained notoriety when Mexico sued the United States in the International Court of Justice on behalf of 51 Mexican nationals asserting that the US had violated the Vienna Convention on Consular Relations, which requires that local authorities inform foreign nationals being held on criminal charges of their right to consult with their country's diplomats. That court ruled that the United States was obliged to have the defendants' cases reopened and reconsidered. The Supreme Court of the United States agreed to hear the case on May 1, 2007.The Bush administration briefed the Supreme Court on the obligation to comply with international treaties. On March 25, 2008, in Medellín v. Texas, the court rejected the Bush administration's arguments and cleared the way for Texas to execute the sentence. The International Court of Justice later ruled that the United States had violated its treaty obligations.

Charles Frederick Albright (August 10, 1933 – August 22, 2020) also known as the Eyeball Killer, was an American murderer and suspected serial killer from Texas who was convicted of killing one woman and suspected of killing two others in 1991. He was incarcerated in the John Montford Psychiatric Unit in Lubbock, Texas.

Carl Wayne Buntion (March 30, 1944 – April 21, 2022) was an American man convicted of capital murder in Texas and sentenced to death. On April 21, 2022, at the age of 78, he became the oldest inmate to be executed in Texas and the state's first execution of 2022.

Angel Maturino Reséndiz (August 1, 1959 – June 27, 2006), also known as The Railroad Killer, was a Mexican serial killer suspected in as many as 23 murders across the United States and Mexico during the 1990s. Some also involved sexual assault. He had become known as "The Railroad Killer", as most of his crimes were committed near railroads, where he had jumped off the trains which he was using to travel around the country.
On June 21, 1999, he briefly became the 457th fugitive listed by the FBI on its Ten Most Wanted Fugitives list, before he surrendered to the Texas authorities on July 13, 1999. He was convicted of capital murder in Texas, and executed by lethal injection in 2006.