Mark Riebe is a convicted murderer currently serving a life sentence
in Florida. He stepped into the spotlight when 29-year-old expecting
mother Donna Callahan went missing from a convenience store in
Pensacola, Florida. The case remained unsolved for seven years until
Mark's brother, William Alex Wells, who was serving a 30-year
sentence for an unrelated robbery charge, confessed to the crime and
implicated Mark.
Mark Riebe was
ultimately convicted of first-degree premeditated ...
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