HILLSBORO — A Washington County judge has decided that a 14-year-old charged with aggravated murder in a fatal stabbing will be tried as an adult.

Juan Carlos Negrete-Vasquez was 13 when he was arrested in October 2009, several days after 19-year-old Eduardo Aldrade-Alcanter was killed in a park and left on a river bank in Cornelius, Ore.

Police say Negrete-Vasquez struck the victim several times in the back of the head with a tire iron, and he and a 20-year-old man took turns stabbing him.

— From wire reports