Sandra Mathias had heard Friday afternoon that someone had been killed in a 40-car pileup on Interstate 80, as a snowstorm swept through the Sierra. Mathias had also wondered why she hadn't yet heard from her father, a Lake of the Pines resident who had made a trip to a veterans hospital in Reno to have his hearing aids checked.But early Friday evening, just after watching news of the massive crash on TV, a sheriff's deputy knocked on her mother's door to share word that her dad, Doug Swasey, had died in the crash."He was always helping other people," said …