CHANDLER — A Chandler high school student involved in a love triangle with his 48-year-old math teacher was stabbed to death after the older woman's 20-year-old boyfriend found them together in her bedroom, police said Tuesday.
Sixto Balbuena, a Navy sailor on leave from California, found his girlfriend naked and the 18-year-old student in his boxer shorts in the woman's bedroom around 2:40 a.m. Friday, according to police reports and court documents.
Balbuena told police that Samuel Valdivia apologized to him before Balbuena began kicking, punching and throwing things at him, according to a police probable cause statement.
Police said Balbuena told them he "wanted to teach the victim a lesson," and stabbed him in the lower side with a kitchen knife. Valdivia later died at a hospital.
He also threw his girlfriend, Tamara Hofmann, to the floor, jumped on top of her and demanded to know how long she had been cheating on him, according to the document.
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Balbuena said he never meant to kill Valdivia, telling police "the blade went in like going into butter."
