On Wednesday at 10 p.m. ET/PT, Showtime will premiere the one-hour documentary 30 days in May, which includes a look into Floyd Mayweather Jr.’s 87-day incarceration at the Clark County Detention Center last year.

The airing comes in advance of 36-year-old Mayweather’s May 4 defense of his WBC welterweight belt against two-division titlewinner Robert Guerrero on Showtime Pay Per View .

The film’s never-before-seen footage features the only interviews Mayweather has conducted about this “life-changing experience,” and takes an intimate look into the life of the world’s highest-paid athlete.

Viewers will glimpse Mayweather’s flamboyant mansion as well as a surprise birthday party for his daughter even as the fighter prepared for life in a jail cell smaller than his bedroom closet.

“This film unveils a rarely seen side of a very public figure,” said Stephen Espinoza, executive vice president and general manager of Showtime sports.

“There are poignant moments, refreshing moments and a candid look into how this experience affected Floyd. I can’t think of a better program to begin our unique lineup of content, which will culminate with Mayweather’s return to the ring against Robert Guerrero on May 4.”

Mayweather (43-0, 26 knockouts) will have been out of the ring for nearly a year to the day by the time he faces Guerrero (31-1-1, 18 KOs) at the MGM Grand in Las Vegas, having last fought on May 5 of last year, earning a unanimous decision victory over Miguel Cotto for the WBA’s junior middleweight belt.

“Our goal was not to tell his whole story — his humble upbringing or all of his accomplishments — but rather to document the life of a modern day superstar leading up to his three-month prison term,” said one of the film’s co-producers, Todd Crites.

“What we are most proud of with 30 days in May is that it reveals a side of Floyd Mayweather that few get to witness — a person who is somewhat of a simple man, caring, eloquent, soft-spoken, and, at times, reflective of not only himself, but also the world around him.”

Photo courtesy of Mayweather’s Twitter account

Lem Satterfield can be reached at [email protected]