Warrant Officer Sean Brendon is the pilot of the FEDRA helicopter that crashed at the Colorado Mountain Plaza. In Left Behind, Ellie finds his body in the wreck while searching for a medical kit, and he is named in the captain's notes.
Francis's report, found in Back in a Flash, says the patient they were flying back to the QZ turned and broke free, then went for the pilot. With Caulfield fighting it, the helicopter spun out of control and came down on the mall.
Brendon was thrown through the windshield and killed in the crash. Ellie finds his body when she reaches the helicopter in The Enemy of My Enemy.
Francis lists the survivors in her report as Ellis, Caulfield and herself, which is how you learn Brendon never made it out of the cockpit. The helicopter he flew belonged to the military's aeromedical service, and it hangs off the mall's upper level when Ellie finally climbs in.
Sean's first name is written on the Crew photo with Larry's and Ellis's, from a party the four held for their captain before the flight.
Ellie Williams
Ellie Williams is the 14-year-old girl Joel is hired to smuggle out of Boston, and your companion for most of The Last of Us Part I. She was bitten weeks earlier and never turned, so the Fireflies believe her immunity could lead to a vaccine. You play as her in the winter chapter and in the Left Behind DLC.
Eugene Ellis
Private Eugene Ellis is a soldier from a FEDRA helicopter crew that crashed at the Colorado Mountain Plaza. In Left Behind, Ellie pieces together his story from his captain's notes and his own recordings while searching the mall for a medical kit for Joel.
Regan Francis
Captain Regan Francis is the medical officer who commanded the FEDRA helicopter crew that crashed at the Colorado Mountain Plaza. Most of the Left Behind artifacts in Colorado are her reports and recordings, which Ellie finds while hunting for supplies to save Joel.
Drew Beckwith
Drew Beckwith is the dead pharmacist Ellie finds in Left Behind, locked in the American Princess store at the Colorado Mountain Plaza. You need the Pharmacy key from his body in Back in a Flash to open the drugstore and keep going.