A Polk man killed his wife and the couple’s two teenagers before fatally shooting himself, according to the Haines City Police Department.

A Polk man killed his wife and the couple’s two teenagers before fatally shooting himself Sunday, according to the Haines City Police Department.

Mark Joseph, 43, called authorities early Sunday to say he had shot his wife and children, and that he planned to kill himself, HCPD spokesman Mike Ferguson said in a news release Monday afternoon.

Joseph told the dispatcher that the door would be unlocked at the family’s home in the Southern Dunes subdivision, Ferguson said.

Haines City police officers and Polk County Sheriff’s Office deputies arrived on the scene at about 7:28 a.m., entered the home and found four people dead — Mark Joseph; Marie Joseph, 43; Darren Joseph, 18; and Markus Joseph, 14, according to reports.

All four had been shot in the head, and Marie Joseph had also been shot in the shoulder, Ferguson said.

The bodies of the teen boys were found in their beds, while Marie Joseph was found on a couch — with her husband sitting in a nearby chair, Ferguson said.

No one else lived at the home, and there were no signs of a struggle, he said.

Investigators found a handgun and five bullet casings in the home, Ferguson said.

They also discovered a possible motive: Mark Joseph suspected his wife was having an affair, the HCPD said.

Mark Joseph was employed at the Ford warehouse in Davenport and with Allied Universal Security Services at the time of his death, Ferguson said.

The investigation is ongoing, he said.