Guillen, 20, has been missing since April and last appeared in the parking lot of her barracks at Fort Hood on April 22, according to the US Criminal Investigation Administration (CID). Her remains were found on June 30.
“It was a sad morning and weekend for us,” Khawam said.
The main suspect in the disappearance was identified by officials on Thursday as Spc. Aaron David Robinson, who shot himself on Wednesday after being questioned by investigators, according to the Killeen Police Department.
Khawam said her family said Guillen had planned to file a complaint of harassment against Robinson the day after her murder and that they believed Robinson was outraged when he told him. However, Robinson initially said Guillen wanted to report having an affair with a married woman, which the Guillen family disputes.
Fort Hood officials said they were unaware of reports of sexual harassment involving Robinson, but the investigation continued.
Cowham said investigators told the family that Robinson had called a woman he had been involved with to help him dispose of Gulen’s body after moving it out of the base.
A woman identified as Cecily Anne Aguilar, who is the estranged wife of a former soldier from Fort Hood, has been arrested by Texas Rangers in connection with Guillen’s disappearance. He is being held in Bell County jail, awaiting political charges, the CID said.
CNN’s Kay Jones and Ray Sanchez contributed to the report.