The jury of three officers and five enlisted found Sgt. Benjamin Johns, 26, not guilty of assaulting Lance Cpl. Harry Lew.
Lew, 21, from Santa Clara in Northern California, committed suicide in Helmand Province, Afghanistan on April 3, just hours after allegedly being mistreated by Johns and two other Marines. He was the nephew of Rep. Judy Chu (D-Monterey Park).
Johns was charged with assault and dereliction of duty for not stopping Marines in his squad from pummeling Lew in retaliation for repeatedly falling asleep on guard duty.
Johns' court-martial took place in Hawaii, where the Marines are assigned.
Chu has called for a congressional hearing into cases of hazing in the military, including that of her nephew.