When a man is murdered — and your superstar tight end is charged with the killing — business as ?usual is out the window.

Bill Belichick showed he understood that yesterday. The coach who’s become a caricature of brusque, monosyllabic obnoxiousness spoke with what seemed like genuine pain and sadness.

“A young man lost his life and his family suffered a tragic loss and there’s no way to understand that,” he told reporters.

Today, Tom Brady will be on the firing line in Foxboro.

In his only statement so far on the slaying of Odin Lloyd and the arrest of Aaron Hernandez, Brady told Sports Illustrated’s Peter King, “I’m focusing on the great teammates I have who are committed to helping us win games. The only thing I care about is winning. Nothing is going to ever get in the way of that goal.”

The superstar quarterback said he’s “moved on” from the Hernandez mess.

Well, he can’t.

Not yet.

When Brady and his fellow team captains face the media today — the first time they’ll be pressed on the Hernandez case — they should follow Belichick’s lead. Forget football. Forget who’ll replace Hernandez in the team’s quest for another Super Bowl championship.

Hernandez is under investigation not just for one murder, but three. And in new court documents, Hernandez’s friend Carlos Ortiz — arrested, too, in connection with Lloyd’s murder — said Hernandez’s Franklin “flop house” was a favorite stomping ground for other football players.

The line to date is that Hernandez did not socialize with other Patriots. So were those football players Hernandez’s teammates from high school or college? Semi-pro players from Lloyd’s Boston team? Or a Patriot player, or two, who have since distanced themselves from the man now under investigation for the murder of two young Cape Verdeans last year in Boston’s South End?

These are questions that are likely to be fired at Brady and his fellow Patriots captains this morning.

I hope Tom Brady — known as much for his nice-guy charm as Belichick is for his glum demeanor — figures out that the football boilerplate he gave to Peter King won’t cut it at today’s press conference.

Surprisingly, unexpectedly, defying nearly all prognosticators, the sour and sullen Bill Belichick set the bar for leadership yesterday.

Tom Brady needs to meet it.