SHEBOYGAN, Wis. &#8212 A gunman in camouflage killed a former co-worker inside a Wisconsin factory early Monday, then committed suicide as officers searched the sprawling building, police said.

Police identified the shooter as Shadow Yang, 40, and the victim as Christina Wollenzien, 29. Both lived in Sheboygan.

Wollenzien was on the job Monday when she was shot to death around 4:30 a.m., said Lt. Michael Williams. Her attacker fired one shot, hitting her in the stomach, then, when she tried to get away, he shot her in the head, said Kirk Engholt, vice president of human resources.

As many as 130 other employees were in the factory at the time and quickly evacuated as officers cordoned off the area. About 20 tactical team officers searched the block-long building before finding Yang’s body; police said he had shot himself.

Police would not comment early Monday afternoon on whether Yang appeared to have specifically targeted Wollenzien.

Yang had quit his job in October, after working there as a materials handler for about five years, Engholt said. The only blemish on his work record was one unexcused absence, he said.

“No problems, no complaints,” Engholt said. “That’s why we’re mystified by what happened.”

Before Monday, police said, the only contact they had with Yang was issuing him a citation for unsafe parking.

Rockline Industries, a family-owned company headquartered in Sheboygan, makes items including coffee filters and baby wipes. It does business in more than 50 countries and has more than 1,800 employees worldwide.