DENVER -

The Colorado Court of Appeals has upheld the murder conviction of a woman convicted in the death of a friend's romantic rival.

The court said Thursday juror instructions were adequate and there were no grounds to overturn the conviction.

Stephanie Deverick was sentenced to life in prison without parole for the throat-slashing death of 45-year-old Diana Young.

Deverick says she had no idea her friend was planning to kill Young when Deverick drove the friend to Young's house.

Thirty-year-old Crystal Mawson was convicted of first-degree murder, conspiracy to commit murder and child abuse in Young's killing.