HBO's "Real Sports with Bryant Gumbel" examines the deaths of Arturo Gatti, Vernon Forrest and Alexis Arguello tonight -- April 13 -- at 10 p.m.

We were able to see an advanced copy of the show. It's hard to watch at times, as the show chronicles the passing of three of boxing's more popular fighters. But if your are a fan of boxing, or are simply intrigued by the human drama that unfolds in our world, then you won't want to miss this. Correspondent John Frankel does an outstanding job trying to understand the death of Gatti and the controversy surrounding it. Be warned, the crime scenes photos of Gatti are chilling.

In the ring, things were simple for these fighters. Outside the ring, it was a bit more complicated. What makes the death of Forrest particularly sad was that it was a random act of violence. What he choose to do after being attacked was heroic. He decided not to simply take it. But had he not stopped at that gas station, at that time ... had he not given chase  ... well ... we all know the answers. The fact is, he did stop there and he did chase after his attacker. He was a fighter to the very end.

One thing that stuck with after watching each segment were the kids and what this all means to them:

Arturo Gatti's son

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Vernon Forrest's godson

And the two sons of Alexis Arguello, one who stood by his father's casket and the other who is too young to understand, but will someday be told about his father.