A small plaque near Sheridan Circle on Embassy Row commemorates two people. Who were they?

The answer is:

The plaque commemorates Orlando Letelier, a former foreign minister of Chile, and his assistant Ronni Karpen Moffitt, who were killed in a car bombing on that spot in 1976. (read more)

Yesterday's question:

Which foreign embassy in Washington D.C. was originally constructed as a mansion for a mining millionaire?

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