The family of the San Antonio firefighter killed battling a massive Northwest Side fire in 2017 filed a lawsuit Wednesday against the manufacturers of a safety device used by firefighters to signal when they are in trouble. According to the lawsuit filed in Bexar County District Court, firefighter Scott Deem was killed after his Personal Alert Safety Systems, or PASS, device did not sound as intended. Deem, along with firefighter Brad Phipps, had entered the Ingram Square Shopping Center on the evening of May 18, 2017 to search for possible victims when they became trapped by the massive blaze. “Despite efforts by other firefighters searching for Deem to listen for the PASS device alarm, the alarm did not sound,” the lawsuit alleges. “The silence was deadly for firefighter Deem.”