William Reynolds, "The F.B.I" actor, died at 90, his son confirmed.

The actor-turned-businessman left the world this month years after quitting the acting industry. Reynolds' son, Eric, first confirmed the saddening news in an exclusive statement to Deadline.

Per Eric, William Reynolds' cause of death was non-COVID pneumonia complications, and he succumbed to the health issue on August 24 in Wildomar, California.

His age made him more susceptible to complications and health issues. In fact, Healthline explains that people like Reynolds - who was 90 at the time of his death - are more likely to have chronic health conditions that can lead to pneumonia.

It remains unknown whether he suffered other health issues before his passing.

PEOPLE asked the family for another official statement, but they have not responded to the request yet. But it was confirmed that public memorial service and tribute would be held for him on September 10 at the Miler Jones Menifee Memorial Park. It will reportedly start at 1:00 p.m.

His fans and colleagues left heartfelt messages to honor his legacy after his death.

William Reynolds Career

Before rising to fame, the Los Angeles native started his career with Universal Pictures. His contract with the company led him to have credits in "Carrie" and "The Son of Ali Baba."

He then landed a deal with 20th Century Fox for its "The Desert Fox," where he played the role of Rommel's son opposite James Mason.

Before continuing his acting journey, he served in Japan during the Korean War. A few years later, he starred in "Cult of the Cobra" and the TV series "Pete Kelly's Blues."

Reynolds' other TV and movie credits include "Twilight Zone," "The Mississippi Gambler," "Francis Goes to West Point," "Away All Boats and The Land Unknown," "Maveric," "Wagon Train," "There's Always Tomorrow," "The Roaring 20s," and "Dragnet," to name a few.

He landed his big break in 1966 when he guest starred as Agent Colby for two seasons of "The F.B.I." Due to his performance, he became a regular in the series starting in 1967.

From there, he continuously played the titular role for six seasons of the nine-season show.

After the series ended, Reynolds added two more credits under his belt - "Project U.F.O" and "Hairway to the Stars."

He left the industry after starring in the 1989 short film to focus on his business.

Reynolds also had a fruitful personal life. He married actress Molly Sinclair and shared two children with her. They were married until her untimely death in 1992.