Yaron Lischinsky was preparing to propose to his girlfriend Sarah Milgrim. He had just bought an engagement ring, and planned to ask on a trip to Jerusalem next week. But on Wednesday night in Washington, they were shot dead by a man who shouted "free Palestine" outside the Capital Jewish Museum as they left an event billed by organisers as a discussion of the Gaza crisis that aimed to "turn pain into purpose". Their deaths have shocked colleagues at the Israeli embassy, sparked international outrage and prompted Israeli leaders to blame "rising hostility" and antisemitism after Hamas attacked the country...