Bio

Mark Allen Geralds was born on March 29, 1967. By 1989, he was working as a carpenter in the Panama City Beach, Florida area and had an extensive prior criminal record with the Florida Department of Corrections dating back to January 1983. In the course of his work, he had previously helped remodel the home of Tressa and Kevin Pettibone.

Murder Story

About a week before the murder, Geralds ran into Tressa Pettibone and her children at a shopping mall; Tressa mentioned that her husband, Kevin, was out of town on business. Later, Geralds separately approached the couple's 8-year-old son, Bart, at a video arcade, asking him specifically when his father would return and when he and his sister left for and came home from school each day.

On the morning of February 1, 1989, while Kevin Pettibone was away and the children were at school, Geralds broke into the Pettibone home. He wore gloves and had brought plastic ties and a change of clothes with him, and had parked his car away from the house to avoid being identified. He bound Tressa Pettibone's wrists with a plastic tie; a medical examiner later determined she had been restrained this way for at least twenty minutes before her death. He beat her, causing bruises and abrasions to her head, face, chest, and abdomen from blunt-force trauma, and ultimately stabbed her three times in the neck, one of the wounds proving fatal. The Florida Supreme Court later characterized this sequence — the advance reconnaissance of the family's schedule, the gloves and ties brought to the scene, the car parked away from the house, and the prolonged restraint of the victim — as clear evidence of premeditation, rejecting Geralds's own suggestion that he had killed her in a sudden rage after she refused to reveal the location of hidden money as unsupported "conjecture."

Geralds took jewelry from the home along with the family's Mercedes, which was later found abandoned in a nearby school parking lot. That afternoon, at 2:00 p.m., he pawned a gold herringbone necklace; testing later found a bloodstain on it consistent with Tressa Pettibone's blood type and inconsistent with his own. He also gave a woman he knew a pair of sunglasses matching ones reported missing from the Pettibone home. Bart Pettibone discovered his mother's body on the kitchen floor when he returned home from school that afternoon.

Investigators connected Geralds to the murder through a combination of circumstantial evidence: his prior knowledge, gained through direct questioning of the victim and her son, of when the family would be away from home; the pawned, blood-stained necklace; the sunglasses given to an acquaintance; shoe impressions at the scene consistent with his footwear; and plastic ties recovered from his car matching those used to bind the victim. He was indicted on March 15, 1989, on charges of first-degree murder, armed robbery, burglary, and grand theft auto. A Bay County jury convicted him in February 1990 and recommended death by a vote of 8 to 4.

Notably, at his original trial, Geralds's defense attorney presented no defense case whatsoever — no witnesses, no expert testimony, no challenge to the forensic evidence, and no evidence regarding his mental health, despite a documented history of bipolar disorder that courts would later accept as legitimate mitigating evidence. Geralds was formally sentenced to death on March 26, 1990. On direct appeal, the Florida Supreme Court affirmed his conviction in 1992 but found errors in the original sentencing proceeding and remanded the case for an entirely new penalty phase; a new jury again recommended death, and Geralds was resentenced on April 13, 1993.

Over the following three decades, Geralds pursued extensive postconviction litigation. His case drew increasing attention from death penalty opponents due to a number of unresolved forensic and procedural questions: blood, fingerprints, and hair recovered from the crime scene did not match Geralds, despite clear evidence of a struggle throughout multiple rooms of the home. A bloody handkerchief found inside the house matched neither Geralds's nor the victim's blood type, and no DNA testing was ever performed on this or other key crime scene evidence. Latent fingerprints and hair fiber evidence recovered from the stolen Mercedes also could not be linked to Geralds. Advocates for Geralds further alleged that investigative notes and records from the Florida Department of Law Enforcement pointing toward other possible suspects were never disclosed to his defense and surfaced only years later, found in a long-held state attorney's file.

In November 2025, Florida Governor Ron DeSantis signed a death warrant scheduling Geralds's execution for December 9, 2025. By this point, Florida had already carried out 17 executions that year without a single reprieve being granted, a pace advocacy groups described as unprecedented and the deadliest year in the state's history. Rather than continue pursuing his remaining appeals, Geralds waived his outstanding postconviction claims and requested that the execution proceed; advocates for Geralds argued this reflected the psychological toll of watching so many fellow death row prisoners taken to execution with no exceptions, describing him as having "lost the will to fight."

Mark Allen Geralds was executed by lethal injection (a three-drug protocol) at Florida State Prison on December 9, 2025, becoming the 18th person executed in Florida that year — a new all-time state record and more executions than any other U.S. state had carried out in more than a decade. He woke that morning at 5:45 a.m., declined a final meal, and had no visitors or spiritual advisor present. He was pronounced dead at 6:15 p.m., at age 58.