(CNN) Fort Hood Pfc. Vanessa Guillen was bludgeoned to death with a hammer in the armory room where she worked, an attorney for Guillen's family said on Thursday.
Guillen's body was transported from the military installation by her killer, attorney Natalie Khawam told CNN, citing details the family learned during a meeting with Army investigators on Wednesday night.
The main suspect in disappearance was identified by officials on Thursday as Spc. Aaron David Robinson.
Khawam said the family told her that Guillen had planned to file a harassment complaint against Robinson the day after she was killed, and that they believe Robinson became enraged when she told him that.
Fort Hood officials said they were not aware of reports of sexual harassment involving Robinson but the investigation was ongoing.
Robinson, 20, killed himself on Wednesday after police confronted him in Killeen, according to US Army Criminal Investigation Command, which calls itself CID. He fled Fort Hood late on Tuesday.
"While law enforcement agencies attempted to make contact with the suspect in Killeen, Texas, Specialist Robinson displayed a weapon and took his own life," CID Senior Special Agent Damon Phelps said at a news conference on Thursday.
Phelps said investigators were looking into Robinson's interactions with Guillen. He said there was "no credible information" Guillen had been sexually harassed or assaulted. He said investigators had conducted more than 300 interviews in the case.
Khawam said investigators told the family that Robinson called a woman he was involved with to help him dispose of Guillen's body after moving it outside the base.
Texas Rangers also arrested a civilian suspect in connection with Guillen's disappearance, according to CID.
The suspect, who has not been identified, is the estranged wife of a former soldier from Fort Hood. She is in Bell County Jail awaiting civilian authorities to press charges, CID said.
Guillen, 20, was last seen in the parking lot of her barracks at the Texas Army base on April 22, CID said.
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