Actually I looked for and couldn't find anything yet, except for a video of him laying in a medical tent.
From what I see he was wounded standing in profile, with his side or angled, this seems logical since he had a vest but had the bullet exit through the left side on the lower back.
If he was shot knowingly that there was nothing wrong done - it's wrong and stupid, must be dealt..
If he was shot by mistake with no intention many other facts have to be taken in account, and compared to similar cases worldwide, journalists take risks knowingly when they go into violent clashes.
If he operated a drone there's no argument for his case at all.
If he was shot on order for being an active Hamas member, and identified as such - regular military conduct against an enemy.