Last year, in one of her first interviews with the international press, Rachel Goldberg-Polin told the New York Times that she hadn’t been able to go “one hour” without thinking that her son was dead.

On Saturday, the Israeli military said it had retrieved the bodies of six hostages from a tunnel in southern Gaza, including that of Hersh Goldberg-Polin. According to the military, Hamas killed the six hostages shortly before their bodies were found. The others reportedly include Ori Danino, Carmel Gat, Alexander Lobanov, Almog Sarusi, and Eden Yerushalmi.

President Joe Biden said he was “devastated and outraged” by the news of Goldberg-Polin’s death. “It is as tragic as it is reprehensible,” he said in a statement released by the White House. “Make no mistake, Hamas leaders will pay for these crimes. And we will keep working around the clock for a deal to secure the release of the remaining hostages.”