Spc. Robert L. Gagnon Jr. was traveling west on I-10 in Holmes County when he suffered a head-on collision with another vehicle traveling the wrong way.

EGLIN AFB — A Seventh Special Forces Group (Airborne) soldier who was killed in a head-on collision on Interstate 10 last week is being mourned by the military community, his family and the fiancé he left behind.

According to a press release from the 7th Special Forces Group (Airborne), on Sept. 17, Spc. Robert L. Gagnon Jr. was traveling west on I-10 in Holmes County when he suffered a head-on collision with another vehicle.

Per a report from the Florida Highway Patrol, 40-year-old Christopher Russ of Graceville, Florida, was traveling the wrong way in a westbound lane at around 10:45 p.m. when he collided head-on with the car driven by 25-year-old Gagnon.

Both drivers were killed in the crash, and an investigation is ongoing.

Gagnon had been engaged to his girlfriend of a year and a half, Kristen Petzold. The fiancé has taken to social media since Gagnon’s death to mourn and share her memories with him.

“Your happiness and your smile lit up my world. I cannot believe you are gone,” Petzold wrote. “I just cannot believe it. I've lost my entire world when I lost you. And I don't know how to go on without you.”

Gagnon was born on May 13, 1992 in Exeter, New Hampshire, and entered active duty military service into the United States Army on Oct. 8, 2013, according to the 7th Special Forces Group (Airborne).

Gagnon attended Basic Combat Training at Fort Jackson, South Carolina, and Military Occupation Specialty Training at Fort Leonard Wood, Missouri.

He completed the United States Army Airborne School at Fort Benning, Georgia, and was assigned to Group Support Battalion, 7th Special Forces Group (Airborne) at Eglin Air Force Base on April 22, 2014 as a Motor Transport Operator (88M).

Gagnon worked in the Special Forces Advanced Skills Company Maritime Operations Training Detachment (ASC MOT-D) as a Small Boat Maintenance Operator, where he maintained the fleet of Zodiac small craft and boat motors for the entire 7th Special Forces Group (Airborne).

The commander of 7th Special Forces Group (Airborne), Col. Patrick T. Colloton, said in a statement, “It was an honor having Robert serve within the ranks of 7th SFG (A). He was a part of our family and will not be forgotten. Our focus now is to provide the best care and support possible to Spc. Gagnon's family and loved ones. I ask that you please keep them in your thoughts and prayers.”

Gagnon was scheduled to be laid to rest with full military honors Wednesday, Sept. 27 in Raymond, New Hampshire.