The investigative podcast about the life of Charles Harrelson arrives May 5.

At age 16, Brett Harrelson was supposed to get a fresh start.

“The podcast covers so much new things about my dad,” Brett tells EW.

Brett Harrelson, Son of a Hitman

Credit: Ron Galella, Ltd./Ron Galella Collection via Getty Images; Courtesy Spotify

“When I thought I knew everything, there’s just been way more than I realized.

It’s mind-blowing.”

Charles Harrelson had a reputation as a high-stakes gambler, a womanizer, and a brute.

Cavanagh first met Brett to discuss the idea of telling his father’s story about a year ago.

There’s one voice Cavanagh hasn’t been able to get yet, one you’ll no doubt recognize.

The actor has rarely spoken about his father over the years.

These days, in addition to helping Cavanagh with his investigation, Brett is in the medical marijuana business.

It’s a job that would have seemed unimaginable decades ago.

It would mean a prison sentence.

I wish I could know all he has done."

Son of a Hitmanis the first step in that journey.Check out the trailer for the podcast here.