The family of Israeli-American hostage Hersh Goldberg-Polin announced the young man’s death early Sunday, ending a relentless campaign by his parents to rescue him that included meetings with world leaders and an address to the Democratic convention last month.

Goldberg-Polin, 23, was seized by militants at a music festival in southern Israel on Oct. 7. The native of Berkeley, California, lost part of his left arm to a grenade in the attack. In April, a Hamas-issued video showed him, his left hand missing and clearly speaking under duress, sparking new protests in Israel urging the government to do more to secure his and others’ freedom.