James Michael Tyler, the actor who played Gunther on “Friends,” reveals that he has stage 4 prostate cancer.

The 59-year-old appeared on Monday’s “Today” show to speak about his cancer journey. He was diagnosed in September 2018, he shared, but it was not caught early. It has since spread to his bones and he can no longer walk. He’s undergoing chemotherapy.

Tyler’s cancer was detected through a routine prostate-specific antigen (PSA) test — his first at age 56. At first, he was treated with hormone therapy and he felt well. However, things took a turn amid the pandemic when he “missed going in for a test.” His cancer mutated and he suffered fractures in his bones, and tumors up and down his spine. He’s currently undergoing chemo, which is “aggressively” fighting the disease.

Tyler recently appeared in the “Friends” HBO Max reunion special — but via Zoom. He said he didn’t want to make it about his illness.

He’s appeared on episodes of “Scrubs” and “Sabrina, the Teenage Witch.” He is also in Matt LeBlanc’s post-Friends series “Episodes.”

(SD-Agencies)