A Tucson man was sentenced to life in prison Monday for stabbing his girlfriend to death in front of the woman's teen daughter.

Armando Lopez, 39, stabbed Marie Mesa, 44, with a steak knife during an argument in 2012.

At trial, Lopez's attorney, John Sando, argued his client was enraged because he thought Mesa was cheating.

"This was a vicious and brutal murder under any circumstances," Pima County Superior Court Judge Richard D. Nichols said before sentencing Lopez, who was convicted in June.

Several members of Mesa's family spoke at the sentencing, asking the judge to impose the maximum sentence.

Lopez apologized and said he knew how much suffering he caused Mesa's family.

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