Another Guard member was in critical condition. The suspect is an Afghan man who once served in a paramilitary unit that worked with U.S. forces, officials said.
Rahmanullah Lakanwal was among the Afghans who came to the United States after the Taliban takeover of Afghanistan. Earlier, he served in a paramilitary unit that worked with U.S. forces.
She has led the heavily Democratic city through confrontations with President Trump, who earlier this year sought to impose federal control over the local Police Department.