Does a unit equipped with Zhonya's Hourglass still deal its combat damage before being recalled to base when it dies?

Ruling: Yes, a unit with Zhonya's Hourglass deals its combat damage before being recalled to base when it dies in combat.

Sequence:

• Combat damage is assigned to units on both sides simultaneously
• Damage is dealt to all units at the same time
• Units with lethal damage are then killed
• Zhonya's Hourglass triggers when the unit is killed, recalling it to base

Nuances:

• If the unit dies through other means before reaching the combat damage step, it will be recalled by Zhonya's and won't contribute damage to combat
• Zhonya's does not target; it applies automatically to the first unit killed, with player choice if multiple units die simultaneously