Before driving into the crowd, the suspect, Darrell E. Brooks Jr., had been at the scene of an alleged altercation involving a knife, but sped away in the red SUV when police arrived, a law enforcement official said.

Brooks, 39, was allegedly behind the wheel when it drove into the parade route. At a news conference Monday afternoon, authorities said that Brooks was the “lone subject” and that he “drove right through the barricades and the officers” at the scene.

Waukesha Police Chief Dan Thompson identified those killed as Tamara Durand, 52; Jane Kulich, 52; LeAnna Owen, 71; Virginia Sorenson, 79; and Wilhelm Hospel, 81.

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