An 85-year-old Cobb County man who served 40 years in the U.S. Army died from injuries sustained in a car wreck, police said today.

Robert F. Graves, of Marietta, died Wednesday, five days after being involved in a two-vehicle crash in the intersection of Johnson Ferry Road and Princeton Lakes Drive, near Marietta, according to Sgt. Dana Pierce with Cobb police.

On May 23 at 7:10 p.m., Graves was driving a 2013 Cadillac ATS southbound on Johnson Ferry Road when for reasons unknown, he turned left into the path of an Acura MDX, Pierce said.

“For reasons unknown, the driver of the Cadillac turned left into the path of the Acura as he was attempting to go eastbound on Princeton Lakes Drive,” Pierce said in an emailed statement.

The Cadillac and the Acura collided, injuring both drivers, police said.

Both Graves and the Acura’s driver, Ali Ozyazgan, 48, of Marietta, were transported by ambulance to WellStar Kennestone Hospital, Pierce said. Ozyazgan’s injuries were non-life threatening, according to police. But Graves later died from his injuries.

No charges are expected to be filed in the crash, which remains under investigation, Pierce said today.

According to his online obituary on ajc.com, Graves was a 1954 graduate of Mississippi State University before serving in the Army from 1954 until 1994. He is survived by a son, two grandsons and their families, his obituary states.