Weeks before, Yaron Lischinsky had made plans to travel to Israel on Sunday with his partner, Sarah Milgrim. He wanted to introduce her to his family for the first time and, relatives said, propose to her.

Instead, Mr. Lischinsky, 30, was laid to rest on Sunday at sunset, in a small cemetery a short walk from his family home in the village of Beit Zayit, nestled in the wooded hills west of Jerusalem.

Mr. Lischinsky and Ms. Milgrim, 26, were gunned down on Wednesday night outside the Capital Jewish Museum in Washington as they left a reception for young professionals and diplomats hosted by the American Jewish Committee.

The gunman, identified by the police as Elias Rodriguez, 31, of Chicago, cried out “Free, free Palestine!” as he was being apprehended — a call heard in protests around the world against Israel and its war in Gaza, which was ignited by the deadly Hamas-led attack on Israel on Oct. 7, 2023, and has killed tens of thousands of Palestinians.

Mr. Rodriguez has been charged with the murder of foreign officials, first-degree murder and other crimes. The U.S. authorities said they would also be investigating the attack as a hate crime and a crime of terrorism.

For their part, Mr. Lischinsky, a research assistant in the political department at the Israeli Embassy, and Ms. Milgrim, who organized and worked with delegations, were both known as peace-seeking bridge-builders, according to their colleagues.