NEW : Authorities charge David Kirk with first - degree murder in his wife 's death . Denver police say he shot and killed his wife while she was on call to 911 . Kristine Kirk told 911 her husband was hallucinating after he had ` ` on some marijuana '' Colorado is first state in the nation to legalize the sale of recreational marijuana .
NEW : Authorities charge Richard Kirk with first-degree murder in his wife 's death . Denver police say he shot and killed his wife while she was on call to 911 . Kristine Kirk told 911 operator husband was hallucinating after he had `` taken some marijuana '' Colorado is first state in the nation to legalize the sale of recreational marijuana .