The two perpetrators in the crime, Syed Farook and Tashfeen Malik, were killed by police in the hours after the shooting.
Here's what you need to know:
Nicholas Thalasinos pictured with his wife Jennifer. (Facebook)
ABC News reports that he was long-term employee of the San Bernardino Department of Health. He formerly worked in Cape May County, New Jersey, as a health inspector. The station says that Thalasinos' wife, Jennifer, works as a teacher in southern California. In addition to his wife, he is survived by his two adult sons.
(Facebook)
The day before his death he posted on Facebook that he had received a threat telling him that he would "die and never see Israel." One of the many tributes to Thalasinos that have been posted on his page read "It is my honest belief that Nicholas was murdered because of his alliance with Israel and Jewish people."
Thalasinos pictured at the Reagan National Library. (Facebook)
In the wake of the Colorado Springs Planned Parenthood shooting on November 27, Thalasinos wrote a series of tweets:
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Question...
So, people on the no-fly list can buy guns....cited as a problem by Obama - that means that those people are in America - why are they still here if they are on the no-fly list?
Seems like they should be deported or put in jail.