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:
1. The Day Before He Died, He Received a Threat Telling Him That He Would Die & Never See Israel
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."
2. In the Wake of the Colorado Planned Parenthood Shooting, He Called PP Employees 'Licensed Murderers'
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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"you will never sucsseed to make a country for jews , because you are criminals and cowards ,you are juste using usa and europe to fight for you , soon you ll get your ass kicked , you will die and never see israel as country believe me never "
What if this thing on his belt had held a 45 caliber 1911 model instead of a phone?