PORT HURON TWP. - Tim Lumley said he heard arguing when he went to let his dog out at his Oak Street home Sunday morning.

He said he heard his neighbor's son yelling at his girlfriend to get out. Lumley said he listened to make sure the woman wasn't being assaulted and was prepared to call police.

He said the yelling lasted only a few minutes before he heard a "bang."

Lumley said he wasn't sure at first if the loud noise was a door slamming or a gun shot.

Then his neighbor's son came out of the house and the woman was screaming.

"Didn't look back, took off," Lumley said of the son.

As the woman called 911, Lumley said he too dialed after he found his neighbor, Dan, inside the home.

"He was standing, leaning over the counter as he was bleeding," he said.

Lumley, who has lived in the 2600 block of Oak Street for more than a handful of years, said he had never had issues with his neighbor.

"He told me he has an open-door policy for Mack," Lumley said of his neighbor.

Police are continuing to search for 19-year-old Mack Kuefler, the Port Huron Township man they believed shot his father in the face early Sunday.

Steve Campau, the St. Clair County Sheriff public information officer, said deputies have not yet located Kuefler.

The woman called 911 from the family's home in the 2600 block of Oak Street about 10 a.m. Sunday stating someone had been shot.

First responders found a 44-year-old man with a gunshot wound to the face.

Campau said he did not have a condition update on the father. The motivation behind the shooting is under investigation.

Campau said a weapon has not been recovered and residents are asked to call 911 if they see Mack Kuefler and to not approach him.

He was last seen leaving the area on a bicycle.

Mack Kuefler is a white man, standing about 6-foot-2 and weighing about 180 pounds, according to a news release by the St. Clair County Sheriff's Office. He was last seen wearing a black tank top and black pants. It is unknown if he is armed.

Campau said Mack Kuefler has an open warrant on a probation violation on a prior unarmed robbery charge.

Contact Liz Shepard at (810) 989-6273 or lshepard@gannett.com. Follow her on Twitter @lvshepard.