Neill's representative, Philip Grenz, said the family decided to disclose the cause of death to counter misinformation circulating after the actor's passing. According to the statement, pneumonia claimed Neill's life after years of intensive treatment for angioimmunoblastic T-cell lymphoma had weakened his immune system. His death was described as "sudden and unexpected."

The actor had revealed in recent months that he was in remission after undergoing CAR T-cell therapy for the aggressive blood cancer. He had spoken optimistically about returning to work and remained professionally active, completing four film and television projects that are yet to be released.

Known worldwide for portraying Dr. Alan Grant in Steven Spielberg's Jurassic Park franchise, Neill enjoyed a career spanning more than five decades. His filmography also included acclaimed performances in The Piano, Dead Calm, The Hunt for Red October, Peaky Blinders and numerous Australian and New Zealand productions.

Following confirmation of his death, tributes continued to pour in from across the global film industry. Director Steven Spielberg remembered Neill as an exceptional actor and a valued member of the Jurassic Park family, while fellow actors including Laura Dern, Jeff Goldblum, Nicole Kidman and Cillian Murphy honoured his talent, warmth and generosity.

Neill's family has requested privacy as they grieve and confirmed that a private memorial service will be held at his farm in New Zealand. Instead of sending flowers, admirers have been encouraged to support charitable organisations that were close to the actor's heart, including healthcare and environmental causes in New Zealand.

Apart from acting, Neill was widely respected for his work as a winemaker through his vineyard, Two Paddocks, and for his contributions to New Zealand's film industry. Friends and colleagues have described him as humble, witty and deeply passionate about storytelling, qualities that earned him admiration both on and off screen.

Sam Neill leaves behind a remarkable cinematic legacy that inspired generations of moviegoers around the world. His memorable performances, particularly in the Jurassic Park series, ensured his place among the most respected actors of his generation, while the confirmation of his cause of death has brought closure to fans mourning the beloved star.