A California man suspected of arming the San Bernardino shooters in 2015 is expected to plead guilty Thursday.
Enrique Marquez Jr., 25, was the only person charged in the attack that left 14 people dead and 22 people wounded. The attackers, Syed Rizwan Farook and Tashfeen Malik, were killed in a gunfight with police.
Marquez was charged with providing the rifles Farook and Malik used and plotting past mass killings that were never carried out.
Prosecutors say there's no evidence Marquez knew about the San Bernardino attack in advance. He did admit to plotting a mass killing of college students in 2011 and 2012, which was never carried out.
Here's an excerpt from Marquez's 911 call made during the shooting.
Here's part of his plea deal. Marquez faces up to 25 years in prison.
Prosecutors have said Marquez agreed to buy the weapons because the attackers feared Farook's appearance might arouse suspicion.
Marquez and Farook met in 2005 after Marquez moved next door in Riverside, Calif. Marquez converted to Islam in 2007, and by 2011, he was reading al-Qaeda magazines and studying radical material, according to federal officials.
The Associated Press contributed to this report.