Don't F**k with Cats: Hunting an Internet Killer is a 2019 true crime docuseries about an online manhunt. It is written and directed by Mark Lewis and was released on Netflix on December 18, 2019. The series chronicles events following a crowd-sourced amateur investigation into a series of animal cruelty acts committed by Canadian pornographic actor Luka Magnotta, culminating in his murder of Chinese international student Jun Lin. It was one of Netflix's Top 5 most-watched documentaries of 2019.