If Warwick is stunned after being declared as an attacker, does his ability still kill units damaged at the battlefield?

Ruling: Yes, Warwick's ability still triggers and kills damaged units even if he is stunned. Stun only prevents a unit from dealing damage with their might during the damage step, not during the whole combat.

Nuances:

• Stun specifically affects damage dealt during the damage step only
• Stun does not disable triggered abilities that occur during other parts of combat