Lt. Gov. John Fetterman listening to speakers. Pennsylvania State Police (PSP) Commissioner Robert Evanchick confirmed today that Trooper Martin F. Mack III, 33, and Trooper Branden T. Sisca, 29, were struck and killed by a driver earlier this morning on I-95 south in the area of milepost 18 in Philadelphia City, Philadelphia County. A male pedestrian was also struck and killed at the same time. .Philadelphia, PA – March 21, 2022. Via Wikimedia Commons.