This is one of three images submitted by Tashfeen Malik as part of her interactions with the U.S. government related to her visas, a U.S. official tells CNN's Pamela Brown. The image was first published by ABC News.
Who's the female San Bernardino killer?
02:45 - Source: CNN
CNN  — 

They were a married couple who left their baby with grandma while they carried out the deadliest mass shooting in the United States since the December 2012 rampage at Sandy Hook.

Syed Rizwan Farook, a U.S. citizen, and his wife, Tashfeen Malik, a permanent resident, massacred 14 people at a holiday party Wednesday at the Inland Regional Center in San Bernardino, California.

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Farook and Malik were later killed in a shootout with police. The attackers’ specific motives remain unclear, but here is what we know about them:

They were husband and wife

Farook, 28, and Malik, 29, were married.

He got to know Malik through an online dating service, Farook family attorney Mohammad Abuershaid said. They met face to face when Farook visited Saudi Arabia, where Malik had moved from her native Pakistan around the age of 18 or 20, according to the lawyer.

She later came to the United States on a fiancée visa and became a legal permanent resident.

This image of Syed Rizwan Farook appears on the dating site iMilap.com.

The couple left their 6-month-old girl with Farook’s mother Wednesday, saying they had a doctor’s appointment.

The grandmother became concerned when she saw reports of the shooting and couldn’t reach Farook.

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Farook worked for the county

Farook, an American citizen, was an environmental health specialist with the San Bernardino County health department, which was hosting the holiday party at the Inland Regional Center where the attack took place.

He had been there five years. Records list a man with his name and title who worked at the agency and made $53,000 in 2013.

He graduated from California State University, San Bernardino, with a degree in environmental health in 2010.

A graduate student ID card from California State University, Fullerton, with Farook’s name on it was spotted by CNN on Friday inside his Redlands townhouse. Jeff Cook, a spokesman for that school, said that records indicate a student by that same name had been enrolled in Cal State Fullerton’s environmental engineering graduate program.

The university issued a statement Friday saying, “Syed Rizwan Farook attended Cal State Fullerton for one semester in Fall 2014 in the online graduate program in environmental engineering. He is not currently enrolled.”

Police haven’t pinpointed a motive

Farook was at the party but left abruptly before the shooting. He seemed angry, witnesses told police. He returned. And, along with Malik, he went into the building and began firing, authorities said.