Three coworkers felt threatened enough to see the supervisor, who listened to both sides and decided to suspend Hiller - for the second time in recent years, sources said.
"She was known as the problem child," said Fred Capps, a 21-year employee and an acting shop steward. "It's always everybody's fault but Yvonne's."
Hiller, an employee for 15 years, who worked as a helper on the dough-mixing floor, was escorted off the property about 8:30. She got in her car and, moments later, returned to the gated back entrance to the plant, at Roosevelt Boulevard and Byberry Road.
She was armed with the .357 Magnum she legally bought in March and carried in her car. She pointed the gun at the two unarmed security guards and ordered them to open the gate.
Hiller, 43, the divorced mother of an adult son, returned to the third floor of the plant. She found the three coworkers in a break room with a fourth employee.
"The one she didn't have a problem with, she told, 'Get out,' and then she started firing," said Capt. James Clark, commander of the Homicide Unit.
LaTonya Brown, 36, a dough mixer, was shot in the head; Tanya Wilson, 47, also a dough mixer, was hit in the side. Both Philadelphia women died at the scene, Clark said.
The third victim, Bryant Dalton, 39, was hit in the neck. He was in critical condition Friday at Thomas Jefferson University Hospital.
During the initial confrontation, Capps said, Hiller was screaming at the three, leaving them shaken. She told Dalton, "I'm going to take you out," Capps said.
While they gave statements to the supervisor, Capps sat with them, Hiller storming into the room twice to interrupt. Then came Hiller's turn.
