The last of the Park Avenue mass shooter’s final victims was in temporary safety in a panic room, only to be killed when she stepped outside of it during a lull in the gunfire, police sources and authorities said.

Midtown mass shooting victim Julia Hyman had made it into a fortified panic room at 345 Park Ave. when gunman Shane Tamura started blasting apart her office, but stepped out for a moment and was “immediately” gunned down,

Julia Hyman sought refuge in a panic room during a Midtown mass shooting but was fatally shot by gunman Shane Tamura.