If I kill a Hostile Takeover Ekko, does the death knell effect go to me or the Ekko player?

Ruling: With the 1.2 rules changes to cleanups, death knells now trigger for their controller on death. In this scenario, you (the player who took control of Ekko with Hostile Takeover) would get the death knell effect.

Nuances:

• This reflects the new cleanup rules in version 1.2 where death knells work as intended for the controller at the time of death