Murder Aboard HMS Nuclear Submarine Astute: Was the Shooter a Muslim?

HMS Astute 

A British sailor and armed sentry aboard HMS Astute, a Nuclear Submarine docked at Southampton, shot two of his officers today.  The shooting happened as the sentries were being changed at midday.  One of the victims has died.  The other is in critical condition.  The shooter is in custody.

The British Navy has stated that the shooting was "not terrorist related."  However, they have not released the name of the shooter.  The question is obvious:  was he a Muslim, in a country where doubting Muslim loyalty is a crime?  Were the shootings another example of tragedy wrought by the insanity of non-discrimination in immigration policy?

Not all political/military murderers are Muslims -- Jared Loughner, the demented shooter of Rep. Gabrielle Giffords, was not.    Nevertheless, I would be very interested in knowing the identity of the U.K. shooter.

Was he a Muslim or not?

Update:  Media identifies shooter as 22 year old Ryan Donovan.  The name is not Arabic and the shooter does not appear to be Muslim, based on that.

Update 2:  Investigators are speculating that Donovan was dreading another planned month at sea and angry for being refused shore leave.