With Walls’ Execution, Northwest Florida Confronts Its Serial Killer Past
With Walls’ Execution, Northwest Florida Confronts Its Serial Killer Past Tricia Elliott December 18, 2025 3:14 pm Crime, Emerald Coast, Okaloosa County In Brief: Frank Walls, Okaloosa County’s most notorious serial killer, is scheduled for execution today. Mark Riebe operated in Northwest Florida from the late 1970s through the early 1990s, suspected of over a dozen murders. Other notable violent crime cases in the region include Edward Zakrzewski II, Aileen Wuornos, and Danny Rolling. Okaloosa & Walton Counties, FL – As Florida prepares to execute Frank Athen Walls on December 18, 2025, the region reflects on the history of serial killers in Northwest Florida. Since 1980, law enforcement and historical records have identified two serial killers as the most prominent in Okaloosa and Walton counties. Frank Athen Walls is widely recognized as Okaloosa County’s most notorious serial killer. Active between 1985 and 1987, Walls was convicted and admitted to five murders, including the 1987 slayings of Ann Peterson and Edward Alger in their Ocean City mobile home. After decades on death row, his execution is set for today. Mark Riebe is often mentioned alongside Walls. Operating in the Northwest Florida Panhandle from the late 1970s through the early 1990s, Riebe was formally convicted for the 1989 murder of Donna Callahan in Gulf Breeze. He has confessed to, and is suspected of, over a dozen additional murders across the region, including cases in Okaloosa County. Many of these confessions remain unverified, but his activity has left a lasting mark on the...
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