If he had this 'mental' problem 'stirring' for over 30 years, it certainly didn't keep him from being a Class II Firearms dealer and thus have possession of the AK-47 he shot the deputy with.

He shot and hit a deputy sheriff responding to his illegal shooting at/near his business partner.

He is by conviction by  a jury of his peers a 'low life who target[ed] that [law enforcement] officer.