Lauri Happonen Cause of Death: League of Legends World Champion Cyanide Dies at 31

Lauri “Cyanide” Happonen, the Finnish esports star who made history by winning the first League of Legends World Championship with Fnatic, has died at the age of 31.

His death has shocked the gaming community, with former teammates, professional players and fans sharing tributes to one of the game’s earliest champions.

Happonen passed away on July 31, 2026, but the news became public nearly three months later, on October 26. Finnish newspaper Ilta-Sanomat reported his passing after receiving confirmation from Finland’s Digital and Population Data Services Agency.

The news has also raised questions about the circumstances surrounding his death, particularly because no information was released publicly for several months.

What Was Lauri Happonen’s Cause of Death?

As of October 27, 2026, Lauri Happonen’s official cause of death has not been publicly disclosed. Neither his family nor Fnatic has released a statement explaining the circumstances of his passing.

Although his death occurred on July 31, the public only learned about it on October 26. The reason for the delay in the announcement remains unknown.

Some social media posts have mentioned cancer in connection with his death. However, those reports appear to confuse Happonen with his former Fnatic teammate Maciej “Shushei” Ratuszniak, who died in April 2025 at the age of 36 after battling cancer.

There is currently no verified evidence that Happonen died from cancer or any other specific medical condition.

Who Was Lauri “Cyanide” Happonen?

Lauri Happonen was a Finnish professional League of Legends player best known for his time as Fnatic’s jungler.

He became an important figure in competitive gaming in 2011 when Fnatic won the inaugural League of Legends World Championship.

At just 16 years old, Happonen became the youngest player to win the tournament, an achievement that remains a significant part of League of Legends history.

His success continued as Fnatic established itself among Europe’s strongest teams. Alongside players such as xPeke, sOAZ and YellOwStaR, he helped the organization secure three European league championships between 2013 and 2014.

Happonen eventually stepped away from professional competition but remained a familiar name among longtime esports followers.

On July 25, 2026, just six days before his death, he participated in a classic League of Legends showmatch in France. His appearance has since become an especially meaningful memory for fans and former teammates.

Fnatic and Former Teammates Remember Cyanide

Following confirmation of his passing, Fnatic released a statement mourning the loss of its former world champion.

The organization remembered Happonen for his historic achievements and the role he played in establishing Fnatic as a leading esports team.

Former teammate Bora “YellOwStaR” Kim also shared an emotional tribute, remembering Happonen as a kind and genuine person.

YellOwStaR recalled meeting him during the July showmatch, saying Happonen still had dreams and plans for his future.

The news has been particularly painful for longtime Fnatic supporters, coming after the death of fellow 2011 world champion Shushei in 2025.

Across social media, fans have continued sharing memories of Happonen’s performances, personality and contributions to early competitive League of Legends.

While questions about Lauri Happonen’s cause of death remain unanswered, his place in esports history is secure. He will be remembered as a teenage world champion who helped shape the competitive scene and inspired future generations of players.