Adam Sismour, 34, was found in his car in a residential neighborhood in Newark, New Jersey, with a gunshot wound and was taken to a nearby hospital, where he died hours later on September 18, 2016. A passerby discovered him and called for help.

A decorated former U.S. Marine who served two tours in Iraq and Afghanistan as a squad leader and machine-gunner, Sismour had transitioned to civilian life as a clinical data manager. He was a father to two children, Olivia and Noah; his family remembered him as a man with a big heart who loved his family, country, and friends.

The Essex County Prosecutor’s Office led the investigation, but no motive has been established and no suspects have been publicly identified; the case remains an unsolved homicide. A fundraiser was started to support his children’s future college education.

If anyone has information about Adam’s death or was in that neighborhood on September 18, 2016, please come forward.