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Cass County teen gets life in prison for killing cousin, 14

A Cass County teenager will spend the rest of his life in prison for the stabbing death of his cousin while the two were home on a snow day from school.

Today in Harrisonville, Circuit Judge Jacqueline Cook sentenced Reyes Olivas, 18, to life in prison without parole for killing Katie Rios, 14, on Jan. 7, 2010, in the family’s rural home.

A jury needed only 25 minutes on Feb. 9 to decide that Olivas acted with “cool deliberation” when he stabbed his younger cousin 13 times.

He said the two argued while watching TV. He got mad when she called him stupid, and he grabbed a knife from the kitchen.

He had been certified to stand trial as an adult. The defense called no witnesses at his trial. His public defenders argued that Olivas acted in temporary rage and should be convicted of second-degree murder.

Cook also sentenced Olivas to a life term for armed criminal conviction.

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