The teenage girl who police say was killed by a U.S. Army recruiter at his Germantown home was "smitten" with him, the 17-year-old's father told the Associated Press.

Michelle Miller and her Army Reserves recruiter, 31-year-old Staff Sgt. Adam Arndt, were found dead Monday of gunshot wounds in what Montgomery County police say is a murder-suicide.

Miller's father told the AP that the Rockville High School senior left her home abruptly Sunday night because someone in her platoon was suicidal and needed help.

Arndt, a native of Wisconsin, had been to the Army Reserves recruiting office in Columbia, Md., in 2011. Recruiters are barred from fraternizing with recruits. Miller was signed up to join after graduation in June.

Arndt was a nine-year veteran who served in Korea, Germany and Turkey.