When does Ekko's Deathknell trigger during combat, and does it happen before or after special cleanup?

Ruling: Deathknell triggers after combat and after units have healed, which means it occurs after cleanup.

Sequence:

• Combat occurs
• Units heal during cleanup
• Deathknell triggers

Nuances:

• When Ekko dies during a showdown from a spell, the Deathknell goes on the same chain as the spell or ability that killed Ekko
• When the Deathknell resolves, the chain closes and the next player in turn order gets focus
• If you played the kill effect at reaction speed in a chain your opponent started, you'll get focus after the chain resolves; if you started the chain, your opponent gets focus first
• The exact timing of Deathknells in combat is currently somewhat unclear, but Riot has stated they are intended to happen after heals
• Regarding Zaun Warrens conquer effect vs Deathknell: Deathknell should resolve before Zaun even triggers