Richard Kirk, the 48-year-old man accused of killing his wife after eating pot candy in Denver has pleaded not guilty to first-degree murder. He’s accused of killing his wife Kristine Kirk last April. She was on a call with 911 dispatchers claiming that her husband was paranoid and hallucinating after eating marijuana candy. On the call, she can be heard begging her husband not to get the gun from the safe, then a gunshot, then the line went dead. The couple had three sons.