The admitted shooter in Friday's double homicide in College Station served in the Marine Corps, and had a previous stalking charge levied against him, one that was dropped by request.

John Thuesen, 25, is accused of the murders of Travis and Rachel Joiner Friday afternoon. He remains in Brazos County Jail. Bond is being withheld.

Thuesen called police Friday to tell them what he'd done with regards to the shootings, and later admitted he had shot the Eldorado siblings, according to College Station Police.

Thuesen is an Austin County native, originally from Cat Spring, but his road to Walcourt Loop in College Station on this past fateful Friday has had some detours.

After graduating from Bellville High School, his studies brought him northwest to Bryan. In the fall of 2002, Thuesen attended one semester at Blinn College.

It wasn't until the fall semester in 2005 that he took classes at Blinn again. He's taken classes at the college every semester but one since then.

The gap can all-but-certainly be explained by his service in the Marine Corps. Officials with the Marines are in the midst of searching Thuesen's record of service for News 3, but we do know he was in combat because he used combat veterans benefits to pay for his education.

The former surgeon general of the U.S. Air Force, Dr. P.K. Carlton, told News 3 that the fact that Thuesen called police and turned himself in without incident may be signs of some severe combat after-effects.

"It shows two entirely different functions of the brain, and so my immediate concern was that he either has a personality disorder, or he is a victim of the Post Traumatic Stress Disorder or Traumatic Brain Injury," said Carlton, now the director of the Office of Homeland Security at the Texas A&M Health Science Center. "All three of those could manifest in the same way."

The capital murder arrest isn't Thuesen's first. In August 2007, Hempstead Police took him into custody on charges of stalking and criminal trespassing. Officials with the Waller County District Attorney's office tell News 3 Thuesen had been harassing his girlfriend at the time, even going to the home of her parents.

However, the DA's office tells us that family asked that the stalking charge be dropped, hoping Thuesen could get help and get life back on track.

He's also faced alcohol-related charges that date back to before his military service in Austin and Walker Counties, according to officials in those counties.

Travis and Rachel Joiner were Texas A&M students. Rachel had been romantically involved with Thuesen.