Who killed the King in Hunter X Hunter?

Right after Meruem aka King finished his fight against Netero, he ended up getting poisoned and faced death.

Hunter X Hunter: 10 Villains Who Could Take On Meruem

One of the saddest death ever : r/HunterXHunter

Hunter x Hunter Episode 134

Who Is the Strongest Character in Hunter x Hunter: Meruem or Gon?

Hunter x Hunter: 10 Facts You Never Knew About Meruem

The 10 Best 'Hunter X Hunter' Villains, Ranked

In Hunter X Hunter, why did Meruem care for humanity? - Quora

Hunter x Hunter: Best Villains, Ranked

Hunter x Hunter: Hisoka, Gon, and more come to life via cosplay

King's death Hunter x Hunter 2011

Hunter X Hunter - 5 People Who Can Kill Meruem

Meruem,Chimera Ant King,Komugi - Hunter X Hunter