The crime that unfolded Wednesday evening sent shock waves through St. Johns, a community of about 4,000 people northeast of Phoenix. The boy had no disciplinary record at school, and there was no indication he had any problems at home, prosecutors said.
"It was such a tragedy," said the boy's defense attorney, Benjamin Brewer. "You have two people dead; you have an 8-year-old in jail. It tugs at the heart strings. It's a shocker, no doubt about it."
On Friday, a judge determined there was probable cause to show that the boy fatally shot his father, Vincent Romero, 29, and Timothy Romans, 39, of San Carlos with a .22-caliber rifle. The boy faces two counts of premeditated murder.
Melnick said officers arrived at Romero's home within minutes of the shooting Wednesday. They found one victim just outside the front door and the other dead in an upstairs room.
Romans had been renting a room at the Romero house, prosecutors said. The two men were employees with a construction company that had a contract to do work at the Salt River Project power plant near St. Johns, which is about 170 miles northeast of Phoenix.
The boy had went to a neighbor's house and said he "believed that his father was dead," said Apache County attorney Brad Carlyon. Police later obtained a confession from the boy, Melnick said.
Brewer said police overreached in questioning the boy without representation from a parent or attorney and did not advise him of his rights.
"They became very accusing early on in the interview," Brewer said. "Two officers with guns at their side, it's very scary for anybody, for sure an 8-year-old kid."
A judge has ordered a psychological evaluation of the child, who was being held at the Apache County juvenile detention center.
Prosecutors aren't sure where the case is headed, Carlyon said.
"There's a ton of factors to be considered and weighed, including the juvenile's age," he said. "The counter balance against that, the acts that he apparently committed."
Carlyon said the boy had no record of complaints with Arizona Child Protective Services.
"He had no record of any kind, not even a disciplinary record at school," he said. "He has never been in trouble before."
City Manager Greg Martin said the community was "saddened" and "shocked."
"Not something that happens very often and hopefully never happens again," he said. "It's been on their minds every since it happened."