BOULDER, Colo. (AP) — A teenager who stabbed his girlfriend's mother to death was sentenced to 40 years in prison Tuesday, after he apologized to her family for causing "pain and tears and grief."

Prosecutors say Linda Damm's daughter, Tess, told Bryan Grove to kill her mother. The 52-year-old was stabbed 18 times in February, and her body lay in her car for nearly a month while Tess Damm, then 15, and her friends used the Lafayette woman's debit card, authorities say.

Grove, 18, pleaded guilty to second-degree murder in November.

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