Handguns 2012 Las Vegas 2
Sig Sauer handguns are displayed during the annual SHOT Show in Las Vegas. Reuters

No legal action is expected to be taken against the four-year-old Arizona boy who fatally shot his father on Friday, authorities told Associated Press.

The father, 35-year-old Justin Stanfield Thomas, was shot by his son at a friend’s house in the northern Arizona community of Prescott Valley. The father-son duo had gone there from Phoenix for a surprise visit.

Prescott Valley Police spokesperson Brandon Bonney told AP that the boy found the loaded gun within minutes of arrival. He questioned his father about the gun and pulled the trigger.

Thomas, an army veteran who served in Iraq according to the The Prescott Daily Courier, was rushed to a hospital where he died. The boy has been with his mother since the shooting.

"They're processing everything to see where they stand with the interviews and the crime scene investigation and see if everything is matching up," Bonney told The Prescott Daily Courier.

Bonney noted that although the gun should have been locked away, Thomas’ friend, whose identity has not been revealed, was unprepared for the visit.

No children lived in the friend's house, according to AP.