WWW.STRAITSTIMES.COM writes: "PHOENIX - A 21-YEAR-OLD Arizona man who was engaged to his former high school teacher has been sentenced to 10 years in prison for fatally stabbing a romantic rival. Sixto Balbuena was convicted of second-degree murder for killing 18-year-old Samuel Valdivia last year after finding him at the Chandler home of 49-year-old Tamara Hofmann, who was his supposed fiancee."