UPDATE: Suspect charged in fatal stabbing at teacher's home

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Man arrested after teen's fatal stabbing

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UPDATE APRIL 20:

CHANDLER -- County Attorney Andrew Thomas announced Monday that Sixto Balbuena, 20, has been charged with one count of second-degree murder.

UPDATE APRIL 13:

CHANDLER - Police say a love triangle led to the killing of a Valley teen and put another man behind bars.

Police say Sixto Balbuena stabbed a Chandler 18-year old to death on Friday. It was apparently all over an affair with a high school teacher who used to teach the victim and suspect.

A student reportedly having an affair with his teacher was fatally stabbed at her home and now his friends and family are left to grieve and wonder why.

This was a young man who, according to court documents, was in a love triangle with his 48-year-old math teacher.

Ramona Gonzalez, the principal at El Dorado High School, admits, "It's been a very difficult day for us."

Students at the high school are trying to cope with the loss of 18-year-old Samuel Validivia and the fact, police say, he was fatally stabbed at his teacher Tamara Hofmann's house. She was a teacher who had been a trusted staff member for two years and taught locally for more than a dozen years.

Gonzalez explains, "Fourteen years of experience in public schools system working with young people, we're just devastated, it's a lot of trust in people in teachers so this is devastating to us."

At the scene police arrested 20-year-old Balbuena, Hofmann's fiance, and one of her former students in the Tempe Union High School District. Balbuena came home from California on leave from the Navy when, according to court documents, he walked into his fiancs house and heard noises in the master bedroom so he grabbed a kitchen knife and saw a man run into the bathroom.

Balbuena then forced his way in where "He found the victim wearing only boxer shorts and his girlfriend, the math teacher, naked."

Balbuena says "He wanted to teach the victim a lesson and stabbed him once in the lower side." "He said that he stuck the knife in too far stating that the blade went in like going into butter."

Balbuena is now charged with murder and Hofmann, according to school officials, "Is suspended pending investigation."

3TV stopped by Hofmann's house but there was no answer.

ORIGINAL REPORT:

CHANDLER - A man is being held on murder charges after allegedly stabbing and killing another man.

Sixto Balbuena, 20, a Tempe resident, is behind bars after police say he stabbed an 18-year-old man just before just before 3 a.m. on Friday in the 2500 block of W. Ironwood in Chandler.

Police received a 911 call from a caller who reported someone had just been stabbed. Officers found the teen suffering from the wounds. He later died at the hospital. The victim's name is being withheld pending next of kin notification.