Can Kog'Maw kill a 5 might unit?

According to the RiftJudge FAQ (ID 7306), Kog'Maw cannot kill a 5 might unit with his Deathknell effect.

The sequence of events is as follows:

1. Combat damage is dealt: Kog'Maw and the opposing unit deal damage to each other.
2. Combat damage heals: Damage is healed from units during the Combat Cleanup step.
3. Deathknell triggers: Kog'Maw's Deathknell triggers and deals 4 damage.

Because the combat damage is healed before the Deathknell damage is applied, a 5 might unit will only have the 4 damage from the Deathknell marked on it, leaving it with 1 might remaining and allowing it to survive.