Leon David Dorsey IV was born on November 17, 1975, in Dallas, Texas. He grew up in a city known for its diversity and culture. Little is publicly known about his childhood or family life.

On the night of April 4, 1994, Leon David Dorsey IV entered a Blockbuster store in Dallas. Inside, 20-year-old Brad Lindsey and 26-year-old James Armstrong were working. Dorsey forced them into the back room and demanded they open the store safe. When Armstrong attempted to escape, Dorsey shot him. He then shot Lindsey, likely to prevent any witnesses. After stealing over $400 from the register, Dorsey left the store, leaving both men to die. Although police reviewed a surveillance video of the incident, they did not identify Dorsey as the perpetrator immediately.

In the weeks following the murders, Dorsey was questioned by the police but insisted he was innocent. Police later discovered that he owned a 9 millimeter pistol, the same type used in the Blockbuster murders, but they dismissed him as a suspect at that time. Months later, on September 11, 1994, Dorsey approached 51-year-old Hyon Suk Chon, who worked at a convenience store in Ellis County. He forced her into the back room and shot her in the back of the head, killing her instantly.

Unlike the earlier case, forensic analysis connected Dorsey’s gun to Suk Chon's murder, leading to his arrest. He confessed to her murder but continued to deny his involvement in the Blockbuster killings. In 1995, Dorsey pleaded guilty to the murder of Suk Chon and received a 60-year sentence.

In 1998, investigators revisited the murders of Armstrong and Lindsey. They reexamined the surveillance footage and sent it to the FBI for further analysis. The investigation suggested that the killer's height matched Dorsey’s. When confronted again, Dorsey ultimately confessed to the murders of Armstrong and Lindsey. He made statements during an interview that were used against him in court.

Dorsey stood trial in April 2000, nearly six years after the Blockbuster murders. The mother of one of the victims, James Armstrong, described Dorsey as evil and claimed he killed for pleasure rather than necessity. In June 2000, Dorsey was convicted of capital murder and sentenced to death.

While on death row, Dorsey was known for causing trouble and earned the nickname "Pistol Pete" among fellow inmates. On August 12, 2008, he was executed by lethal injection at the Huntsville Unit in Texas. In his final moments, he addressed the victim’s families, saying he loved them and forgave them.