Clifford Thomas Backmann, 56, was shot and killed during a robbery on October 10, 2009, while working alone at a construction site at 6960 Bonneval Road in Jacksonville, Florida. He managed to call 911 and give some information before dying, but investigators were unable to identify a suspect from those details.

Born April 25, 1953, in Long Island, New York, Backmann worked as a superintendent in commercial construction. Family and friends remember him as an avid reader, a Civil War enthusiast, and a lover of dogs and classical music. The Jacksonville Police Department has not announced any arrests, and the investigation went cold despite an $11,000 reward.

Backmann’s son, Ryan Backmann, became an advocate for victims’ rights and founded Project Cold Case to keep unsolved homicides like his father’s in the public eye. Is there anyone who knew Clifford or who has information that could help finally identify the person who robbed and shot him?