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.

What's in a Fight: Netero vs Meruem (Hunter x Hunter's Analysis) – Fiction Realm

How did Meruem die in Hunter x Hunter? - Quora

Komugi, Wiki

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

Hunter x Hunter: 10 Facts You Never Knew About Meruem

How did Meruem and Komugi die in Hunter X Hunter? - Quora

15 Most Shocking Deaths In Hunter x Hunter - Otaku Fantasy - Anime Otaku, Gaming and Tech Blog

The 15 Saddest Moments From Hunter x Hunter, Ranked

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