Prescott Valley teen won't be charged in brother's stabbing

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Riley Martinez By Jennifer Thomas Riley Martinez By Jennifer Thomas

PRESCOTT VALLEY -- The Yavapai County Attorney's Office says it won't charge a Prescott Valley teenager in the stabbing death of his brother.

Prescott Valley police say Riley Martinez, 18, got into an argument with his brother, Kyle Martinez, 22, of Mayer at approximately 3 a.m. Sunday. The argument escalated into a physical altercation.

During the fight, police say Riley Martinez grabbed a knife and stabbed his brother in the chest. He fled the home and went to a neighbor's house. He reportedly entered their home with a knife and told them to call 911 because he stabbed his brother.

After undergoing emergency surgery, Kyle Martinez was airlifted to Good Samaritan Hospital in Phoenix for advanced treatment. Prescott Valley police Sgt. Brandon Bonney said Martinez died Monday morning.

Police arrested Riley Martinez on an attempted murder charge on Sunday.

A spokeswoman for the Yavapai County attorney, Penny Cramer, says an investigation concluded that Riley Martinez acted in self-defense.

The Associated Press contributed to this report.