The “Forrest Gump” actor lost his son to cancer in January.

Gary Siniseopened up about the decision to step away from Hollywood to be with his family during difficult times.

“We were in the cancer fight during that time,” said Sinise.

Actor Gary Sinise visits Build Series to discuss ‘Snowball Express’ at Build Studio on March 22, 2018

Gary Sinise.Noam Galai/Getty

“My wife had been diagnosed with breast cancer.

My son was diagnosed with this very rare cancer within two months of each other.

I kind of had my hands full.”

Noam Galai/Getty

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McCanna, also referred to as “Mac,” was diagnosed in 2018.

He died at the age of 33.

“Our son was fighting this cancer with no cure,” said Sinise.

“I had to stop,” said Sinise.

“That gave me a lot of joy, just watching him kind of enjoy those moments.”