The father of a 27-year-old who was killed by the jealous ex of another victim said the gunman had an altercation with his son at a bar before a fatal shooting at a Pennsylvania car wash.

Timothy Smith used three guns to kill his ex-girlfriend, 25-year-old Chelsie Cline, and friend Bill Porterfield, 27, along with two others at Ed's Car Wash early Sunday in Melcroft, Pa., officials told ABC News.

Scott Porterfield, Bill Porterfield's father, told the Tribune Review he saw security footage from Tall Cedars lounge showing Smith placing his hand on his son's shoulder.

A staff member asked Smith to leave the bar and Porterfield stayed behind, the father said.

Hours later, Smith — wielding an assault rifle and clad in a ballistic vest — opened fire at Porterfield and Cline when they arrived at the car wash just before 3 a.m.

"It was definitely meant to be a massacre," Porterfield's pregnant widow, Jenna Porterfield, told ABC News. "That's what he (Smith) went there to do and that's what he did."

Smith then fatally shot Courtney Snyder, 23, and Seth Cline, 21 — Chelsie's half-brother — as they arrived in the car wash parking lot, Fayette County District Attorney Richard Bower told the network.

A woman in the back of the car was wounded and hospitalized.

Smith, who then turned the gun on himself, died Sunday night after several hours of struggling in the hospital, officials said.

Chelsie Cline's half-sister has told local news outlets that Smith became obsessed with his ex-girlfriend.

"He would leave her stuff on her car," her half-sister, Sierra Kolarik, told local news channel WPXI. "She'd get done with work and she'd come out and there would be a case of beer on her hood or scratch-off tickets or anything. If he found out she was sick, he'd bring her flowers."

Cline reportedly spent a bulk of the weekend with Porterfield, her former classmate who had just gotten married in November.

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Jenna Porterfield, who is expected to give birth in August, said rumors initially came out her husband may have been having an affair with Chelsie Cline, which she said were false.

"I confirmed that was false," Jenna Porterfield told ABC News. "My husband only talked about me and making our family work. He was perfect."

She heard about her own husband's death through Facebook on Sunday morning, ABC News reported, and rushed to the area to see for herself.

"Now, I'm planning my husband's funeral," she told the network.

But she hasn't heard anything from state police about why they were in the parking lot and how Smith found them.

"I question that myself," she told ABC News. "That was one of the reasons I was angry. They have surveillance cameras all around there. They should have some answers."