He is charged with raping and murdering Judilianna Lawrence, 19, a developmentally disabled woman he had met online. Specialist Marko admitted to the police that on Oct. 10, he took Ms. Lawrence to the mountains overlooking Colorado Springs, blindfolded and raped her, then slit her throat, according to the El Paso County Sheriff’s Office arrest affidavit. The affidavit also said that three days later  the day he believed he would transform into Black Raptor  Specialist Marko took the police to where he had left her body.

The slaying of Ms. Lawrence, a gentle woman who was sheltered by her family because of her severe attention-deficit disorder, led Senator Ken Salazar, Democrat of Colorado, to request an Army investigation into the Fort Carson soldiers who have been charged with murder.

Since Ms. Lawrence’s murder, two people have come forward to the authorities and accused Specialist Marko of rape or sexual assault, according to the Army document obtained by The New York Times. Both incidents prompted law enforcement investigations. The Army document is a synopsis of interviews with military personnel who knew Specialist Marko, family members and a psychiatrist, among others.

Five days before the death of Ms. Lawrence, Specialist Marko is said to have picked up a 14-year-old girl on the road who had fled a psychiatric hospital. The girl claims that a man matching the specialist’s description drove her to the mountains and raped her. Her description of the location “matches” the area where Ms. Lawrence was killed.

Another woman stated that in May, Specialist Marko “aggressively” tried to have sex with her in his barracks room. After a soldier knocked on the door, he stopped the assault, she said.