Lischinsky, who served as a Middle East affairs advisor at the Israeli embassy in Washington, was killed alongside his fiancée, Sarah Lynn Milgrim, by a lone gunman who opened fire on a group leaving a diplomatic event on Wednesday night.
A suspect, identified by police as 30-year-old Elias Rodriguez of Chicago, was taken into custody shortly afterward. Video footage shows him shouting "free free Palestine" after his arrest as police took him into custody.
The Israeli Foreign Ministry confirmed that both victims were locally employed staff members who had been active in cross-cultural dialogue and reconciliation efforts.
In previous posts on the social media platform X, Lischinsky had voiced support for the people of Iran, distinguishing them from the Islamic Republic. In a Nowruz message last year, he wrote: "The people of Iran are not our enemies. We wish them all the best and hope that one day peace will return."
Lischinsky had also participated in a conference organized by the National Union for Democracy in Iran (NUFDI), a US-based advocacy group, where he was seen in photos alongside Iranian opposition figures. One image shared from the event included a flag bearing the historic Lion and Sun emblem of Iran.