Michael G. Stone, a friend of Marquez, told ABC News that Marquez said something at a party months ago that stuck with him, and took on new light following last week’s massacre.

“He said something along the lines of, ‘There’s a lot of Muslims in our own backyard, just ready to go haywire and attack,’” Stone told ABC News. “And we didn’t think nothing of it. We just brushed it aside, you know. He was drunk, so I don’t know.”