Sierra Simone Sunshine Clayborn, 27, was killed on December 2, 2015, in the mass shooting at the Inland Regional Center in San Bernardino, California. The attack occurred during a holiday party for the San Bernardino County Department of Public Health, where she worked, and Sierra was one of 14 victims who were killed that day.

Authorities say the shooters were Syed Rizwan Farook, a health inspector with the department, and his wife, Tashfeen Malik. After opening fire at the gathering the couple fled but were later killed in a confrontation with law enforcement. Federal investigators treated the incident as an act of terrorism and reported that the pair had been radicalized, had collected weapons and explosives, and had planned the attack.

Family members joined other victims’ families in pursuing legal action, including wrongful death claims related to security and prevention.