That's too bad
You think he might be in jail for life or get the death penalty?
No, you usually get up to 15 years for murder and your time can be reduced as low as 5 years. But this case is just one out of many that show insanity of laws. Here is the law-you must respond if attacked with lesser or equal force/weapon...so you go ahead and ask intruder in middle of night what kind of weapon he has and than say please let me get such and such weapon to protect my self from you....just insanity, many people signed petition for his release but who knows what will happen...
Any way, American vet is in same position, his state enacted European laws (Serbia and most other European countries have very similar laws regarding these cases)