A Fort Bragg soldier was charged with first-degree murder Tuesday in the death of a pregnant colleague whose partially decomposed body was found in a motel bathtub more than a month ago, police said.

Edgar Patino, 27, of nearby Hope Mills, was arrested at his home without incident just after 8 p.m. in the death of Army Spc. Megan L. Touma, said Fayetteville police watch commander Lt. Lars Paul. Paul said Patino was stationed at Fort Bragg but couldn't provide his rank or unit.

On Tuesday, police charged Patino with first-degree murder, but did not release a cause of death or motive. An 11 a.m. news conference was scheduled Wednesday, the same day Patino is scheduled to appear in court.

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Touma, 23, was found dead June 21 at a Fayetteville motel after a maintenance supervisor smelled a foul odor coming from a room with a "Do Not Disturb" sign. A dental specialist from Cold Spring, Ky., Touma was seven months pregnant and had recently arrived from a base in Germany.

She was temporarily assigned to Fort Bragg's 19th Replacement Company, and would have eventually been assigned to work at a base dental clinic.

Touma was last seen alive not long after she arrived on June 12 at Fort Bragg in North Carolina, home to the Army's 82nd Airborne Division and its Special Operations Command. She was divorced and authorities have said nothing about the father of her child.

Police have said a Fort Bragg soldier studying psychological operations was a person of interest in the case. They said the person was training at a school where special operations ranging from raids to reconstruction projects are taught. It wasn't immediately clear if police were referring to Patino.

Police also investigated a letter sent to The Fayetteville Observer from a person who claimed to be a serial killer responsible for Touma's death. The letter featured a circle-and-cross drawing that had also been drawn in lipstick on the motel room mirror and was the same as one used a generation ago by San Francisco's infamous Zodiac Killer.

Police have said they believed the letter was written to mislead investigators and the media.

Touma is among three servicewomen killed in recent months near North Carolina military bases.

Earlier this month, Army 2nd Lt. Holley Wimunc, 24, was found dead in a wooded area near Camp Lejeune three days after a suspicious fire at her Fayetteville apartment. Her estranged husband, Marine Cpl. John Wimunc, who is stationed at Camp Lejeune, has been charged in her death.

In January, the burned body of Lance Cpl. Maria Lauterbach, 20, who was eight months pregnant, was discovered in a shallow grave near Camp Lejeune in the back yard of her former co-worker and a man she accused of rape, Cpl. Cesar Laurean. Laurean fled to Mexico but was arrested April 10. He has been charged with murder and is awaiting extradition.

Click here for more on this story from FOX affiliate WRAL TV in Raleigh.