Enrique Marquez, the 24-year-old former neighbor of the San Bernardino shooters Syed Rizwan Farook and Tashfeen Malik, was indicted Wednesday on charges of conspiring to provide material support to terrorists, Reuters reports.

The indictment, handed down by U.S. District Court in Los Angeles, charges Marquez with conspiring with Farook, in 2011 and 2012, in a terror attack that they never carried out, and of lying to federal authorities about the purchase of two assault rifles Farook and Malik used in their deadly rampage earlier this month.

According to the Los Angeles Times, the indictment supersedes an earlier criminal complaint, and brings the total number of charges to five. If convicted, Marquez now faces up to 50 years in federal prison.

In a statement, David Bowdich, assistant director in charge of the FBI’s Los Angeles field office, said, “Mr. Marquez is charged for his role in a conspiracy several years ago to target innocent civilians in our own backyard with cold-blooded terror attacks, and with providing weapons to an individual whose endgame was murder.”

“The covert nature of the defendant’s alleged actions is a stark reminder of the challenges we face in preventing attacks planned in the name of violent jihad, and underscores the critical need for those with knowledge about terror plots to come forward.”

Prosecutors say the two men met in 2004. While Farook is said to have introduced the younger man to radical Islamic theology, Marquez, who called 911 the day of the December 2nd shooting and reported that Farook had used his gun, is not thought to have had prior knowledge of the recent attack.

Later, he checked into a mental health institution, the Times reports, and voluntarily spoke with federal agents investigating the shooting, having waived his right to an attorney while hospitalized.

Photo via AP Images. Contact the author of this post: brendan.oconnor@gawker.com.