The man who authorities said committed suicide after he shot a woman at a York County bar last night likely suffered from post-traumatic stress disorder following military tours in Iraq, according to his father.

Lenard Guise of Mount Holly Springs said Arthur Guise, his son, did two tours in Iraq during his time in the Army.

"I think that affected him," Guise said. "He was going to some counseling to help. He saw a lot in Iraq. It changed him."

County Coroner Pam Gay said Arthur Guise, 31, shot and killed Sharon Williams, 33, of Mount Holly Springs before shooting and killing himself at Flapjacks Pub, on Route 15, just outside Dillsburg.

Reports have indicated that about 50 people saw the shooting, which occurred shortly before 9 p.m. on the bar's deck.

Carroll Township police are investigating the incident. They couldn't immediately be reached for this report.

This photo, taken from Arthur Guise's Facebook page, shows Guise, center, with his family.

Scott Osterhoudt -- whose son was tending bar at the time of the shooting -- described the shooting as happening "within five seconds" at a time when the "deck was packed."

"He came onto the deck and walked right up to her -- she was sitting at a table on the deck -- and just walked up right behind her and shot her three times," said Osterhoudt, whose wife manages the bar, which is owned by Osterhoudt's father-in-law.

Osterhoudt said the man then "put the gun to his head and shot himself."

"Nobody even knew what was happening," said Osterhoudt, who arrived at the bar shortly after the shooting and drew his account from witnesses who were there, including his son.

When reached this morning, Arthur's father said all of this was "very unexpected," and it's a difficult time for his family. Lenard Guise said, to his knowledge, his son and Williams had previously dated for about a year and a half.

Lenard Guise said, to his knowledge, Williams had been at the bar with another date. Though, Madi Osterhoudt, Osterhoudt's daughter who works at the bar, said that man was just a good friend.

When asked whether his son had ever talked about missing Williams, Lenard Guise said such personal topics didn't typically come up between the two.

"He was a very good boy," said Guise, who described his son as "very social" before his military tours. After that, he said, his son withdrew from people and kept more to himself.

Guise said when Arthur returned home safe from Iraq they didn't realize how much his tours had affected him.

"This is the kind of news you expect to hear when he's in Iraq, not when he's home," Guise said.

Lenard Guise said he didn't know Williams' family.

"I'm sorry to hear of their loss, too," Guise said. "It's a shame things like this happen to any family."

Editor's note: This post was updated to include information from an interview with York County Coroner Pam Gay. The post also has been updated to include a comment from Madi Osterhoudt and to note that Scott Osterhoudt was not present for the shooting, but drew his account from witnesses who were at the pub during the shooting.