GREEN BAY, Wis.—A gunman killed two people at a Wisconsin casino restaurant and seriously wounded a third before he was killed by police late Saturday, in what authorities said appeared to be a targeted attack. Brown County Sheriff’s Lt. Kevin Pawlak said investigators believe the gunman was seeking a specific person he was angry at. “He was targeting a specific victim who was not there, but he decided to still shoot some of the victim’s friends or co-workers, it appears,” Pawlak said. Neither the gunman nor the shooting victims were immediately identified. Pawlak wasn’t sure if the shooter was a former employee of the restaurant, but said “it appears there’s some relationship that had to do with employment.” “Whether or not they all worked there, we’re still working on,” he said. The wounded person was being treated at a Milwaukee hospital, Pawlak said. The attack happened around 7:30 p.m. at …