Editing Mark Riebe (section)

===Donna Callahan===
In August 1989 Mark Riebe and his brother Alex Wells abducted a young woman named Donna Callahan from a convenience store in Florida. Callahan was pregnant with her second child at the time and begged to be let free. The exact details are unclear, but what is known is that Callahan was strangled to death in the back of the car as the two of them drove away. The brothers then buried her in a shallow grave nearby.

After the victim's father petitioned the US president himself, a special taskforce was formed to solve Callahan's disappearance. For seven years the case went unsolved, until finally Alex Wells confessed his involvement but said Mark had killed her. He led police to the body, buried just 350 yards away from Riebe's home. Both brothers were convicted of murder, with Riebe pleading guilty to murder to avoid the death penalty. He received a life sentence.