Sam Neill has just disclosed that he is undergoing treatment for stage-three blood cancer.

The “Jurassic Park” actor revealed the news in a candid new memoir titled Did I Ever Tell You This?, set for release on Tuesday.

A rep for Neill told ET, the 75-year-old actor “is very well and back at work starring opposite Annette Bening in the upcoming limited series ‘Apples Never Fall’.”

The rep added, “Thank you for your good wishes. Sam has no further comment beyond what’s written in his book.”

The actor recently interviewed with The Guardianwhere the actor discussed the revelation and many other personal subjects.

“The thing is, I’m crook. Possibly dying,” Neill opens in chapter one, “I may have to speed this up.”

READ MORE: Sam Neill Reveals Why He’s Thankful He Wasn’t Cast As 007 After Auditioning With ‘Extreme Reluctance’

Neill clarified that the book is not a cancer memoir, but the devastating illness acts as a “spiral thread” throughout the memoir.

Neill first noticed his swollen glands during the press tour for “Jurassic World Dominion” in March last year and was quickly diagnosed with angioimmunoblastic T-cell lymphoma.

The actor briefly relied on chemotherapy before the treatment failed, leading him to receive a new chemotherapy drug which he will continue to use monthly for the rest of his life, even though he is now cancer free.

READ MORE: Laura Dern & ‘Jurassic Park’ Co-Star Sam Neill Address Whether Their Characters’ 20-Year Age Gap Was ‘Completely Appropriate’

“I can’t pretend that the last year hasn’t had its dark moments,” he tells The Guardian. “But those dark moments throw the light into sharp relief, you know, and have made me grateful for every day and immensely grateful for all my friends. Just pleased to be alive.”