I think Erik Scott was a good man with a troubled life, who would have been dead from prescription drug abuse before the age of 40 without detoxification. Since his girlfriend most likely was aiding his drug abuse and his father was in denial, his only chance for survival would have been intervention by the authorities, which was already in progress at the time he died.
Was there a round in the chamber, or not? I know the LV Metro PD has been kind of busy digging up dirt on Erik for the last three months, so maybe they haven't had a chance to check the chamber of Erik's pistol to see if there was a round in it or not...