
CNN and NBC said the charges are expected to be filed on Thursday against Enrique Marquez, a friend and former neighbor of radicalised Syed Rizwan Farook, who carried out the Dec. 2 attack with his wife, Tashfeen Malik, that killed 14 people and 21 injured.
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Marquez, who had checked himself into a Los Angeles-area psychiatric facility shortly after the shootings, had several connections to Farook and Malik and quickly became a key figure in the investigation of the shootings.
The Federal Bureau of Investigation raided his home and questioned him for several days.
During the investigation, a law enforcement source said Marquez, who had converted to Islam, and Farook apparently had plotted some sort of attack around 2012 but abandoned the idea.
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Marquez legally purchased the two AR-15 assault-style rifles that Farook and Malik used in their attack on a holiday party of Farook's co-workers before they were killed in a shootout with police a few hours later.
Marquez, who had worked at Walmart and at a bar recently, also is related to Farook's family by marriage. His wife and the wife of Farook's older brother are sisters.
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