A 12-person jury declared Randal Cosgrove not guilty of attempted second-degree murder and not guilty of aggravated assault Friday.

The jury of nine women and three men heard three days of testimony before deliberating on a verdict for about an hour and a half.

“The jury is always right,” said Teton County Deputy Prosecuting Attorney Clark Allan. “That’s the way it works. We had a fair trial and that’s how the system works. The jury is always right.”

Cosgrove, 47, was accused of shooting his fiance’s 43-year-old son, Joe Hansen in September.

Cosgrove’s attorneys, Greg Blenkinsop and Traci Sampson, argued that Cosgrove acted in self-defense when he shot at Hansen.

“There is only one issue here that matters,” Blenkinsop said in his closing arguments. “It’s self-defense. It applies to both [charges – assault and attempted murder] and we don’t have to prove that. The state has to prove Mr. Cosgrove did not act in self-defense.”

Cosgrove was not charged for a shot that went through Hansen’s shoulder because it was fired in the bedroom of the home where Cosgrove lived in Rafter J.

Cosgrove was only charged for the shots he fired outside of the house, Allan said.

Cosgrove said in a taped interview with Teton County Sheriff’s Office investigators that he shot at the tires of Hansen’s car when Hansen tried to run him over.

Allan argued Friday that the story was unbelievable because a bullet went through windshield of Hansen’s car directly in front of the driver’s face and was found planted in the passenger side headrest.

“He certainly intended something when he put this bullet through the windshield,” Allan said to the jury Friday. “And it wasn’t an invitation to a birthday party.”

Blenkinsop argued that Hansen’s recollection of events the night of the shooting were ever-changing and unreliable. He said there was a shortage of physical evidence and there was no way to know “beyond a reasonable doubt” that Cosgrove was not acting legally in self-defense when he fired at Hansen