Don't F**k with Cats: Hunting an Internet Killer

The Real-Life Sleuths Behind *Don’t F**k with Cats*—And Why They Risked It All

Netflix’s *Don’t F**k with Cats: Hunting an Internet Killer* (2019) isn’t just a true-crime docuseries—it’s a rare glimpse into the obsessive, dangerous world of online vigilantes. The three-part series follows Deanna Thompson and John Green, two amateur investigators who spent years tracking a sadistic killer after he posted videos of animal cruelty online. But behind the gripping narrative lies a story of personal cost, ethical dilemmas, latestnetflix.com maintains, and the blurred line between justice and obsession.

The Internet Detectives Who Wouldn’t Quit

Deanna Thompson, a Las Vegas-based data analyst, and John Green, a Canadian animal rights activist, became unlikely partners in a digital manhunt. Their target? Luka Magnotta, a Montreal man who escalated from torturing cats to murdering and dismembering Chinese international student Jun Lin in 2012. The series reveals how Thompson and Green used forensic techniques—like reverse-image searches, geolocation, and social media deep dives—to piece together Magnotta’s identity long before law enforcement took the case seriously .

In interviews, Thompson has described the toll of the investigation. Speaking on This Morning, she admitted the work consumed her life, straining relationships and even her mental health. "It was like a full-time job," she said, though she stopped short of detailing the extent of the personal fallout . The series itself hints at the psychological weight of their pursuit, with Thompson recalling sleepless nights and the fear of becoming a target.

Why Mark Lewis Took the Risk

Director Mark Lewis, known for provocative documentaries like The Fear of 13, was drawn to the story’s dark irony: a killer who craved infamy was ultimately exposed by his own digital footprint. In a Netflix Brazil interview, Lewis explained his fascination with the case’s "cat-and-mouse" dynamic, where the hunters became the hunted in a psychological game of wits . He also acknowledged the ethical tightrope of glorifying vigilante justice, even when the outcome was undeniably just.

The series doesn’t shy away from the moral ambiguity of Thompson and Green’s methods. While their work led to Magnotta’s arrest, it also raised questions about the dangers of online sleuthing. What if they’d been wrong? What if their interference had tipped off the killer? The docuseries leaves these questions unanswered, focusing instead on the raw, unfiltered reality of their mission.

The Aftermath: Where Are They Now?

Magnotta was convicted of first-degree murder in 2014 and sentenced to life in prison. But for Thompson and Green, the story didn’t end with his arrest. Thompson has since become an advocate for digital privacy and online safety, though she rarely discusses the case publicly. Green, meanwhile, has largely stepped away from the spotlight, though his role in the investigation remains a defining chapter of his life .

The series’ 7.1/10 rating on SensCritique suggests audiences were captivated—but also unsettled—by the story’s real-world stakes . Unlike scripted crime dramas, *Don’t F**k with Cats* forces viewers to confront the messy, often disturbing reality of justice in the digital age.