Kristine Kirk was allegedly shot and killed by her husband after he began hallucinating following ingesting a marijuana candy in April.
While on the phone with police, Kirk urged officers to "please hurry" according to Denver ABC affiliate KMGH.
According to a detective who reviewed the 911 tape, Kirk said "her husband was talking like it was the end of the world ... he had asked her to get the gun and to shoot him, and she is scared of what he might do because her three children are in the house with her."
"According to the notes, he grabbed a gun and she screamed and the line disconnected," at which point the responding officer told the dispatcher to speed deployment of backup.
"At the time, it was prioritized appropriately as a class-one priority, but no information was provided, verbally to the officers, to update that situation," Denver Police Department Commander Matt Murray said.
"Officers were not given, verbally, information as they were responding to the scene. It's not possible or safe for officers to be driving to a crime and reading a screen."
Richard Kirk is charged with first degree murder. The brand of marijuana candy he purchased has been pulled from store shelves.