Enrique Marquez spent countless hours next door tinkering on old cars in the driveway of Farook's Riverside home. Marquez converted to Islam, Farook's religion, and made trips to pray in a local mosque. He married a member of Farook's extended family, a Russian emigre.

And ultimately, federal authorities say, Marquez bought the two assault-style rifles Farook and his wife, Tashfeen Malik, used in the worst terror attack on U.S. soil since Sept. 11, 2001.

via www.latimes.com