The Jacksonville Sherrif's Office is investigating an undetermined death Sunday night near the Highlander Apartment Homes on Jacksonville's Northside.

JSO Homicide Sergeant Robert John said officers were patrolling the area near 10600 Monaco Drive when they found a dead adult male who had been shot inside his car.

JSO said they haven't verified the identity of the man and they aren't sure if he lived in the complex or why he was there.

This is a developing story. Stay with First Coast News for updates.