WASHINGTON — The soldier at the wheel of a truck that overturned in June, killing a West Point cadet and injuring 21 others on the way to a training exercise, has been charged with involuntary manslaughter, negligent homicide, reckless driving and dereliction of duty, the Army said on Tuesday.

The soldier, Staff Sgt. Ladonies P. Strong, faces a preliminary hearing in mid-October to determine whether her case will be referred to a court-martial trial, according to Lt. Col. Patrick Husted, a spokesman for the 3rd Infantry Division at Fort Stewart, Ga., the sergeant’s parent command.

The cadet who was killed, Christopher J. Morgan, died at the scene of the accident. Two trainers and 19 other cadets were injured.

Mr. Morgan, 22, who was expected to graduate next year, was a member of the academy’s wrestling team and was recruited after a standout wrestling career at his high school in West Orange, N.J., his hometown.