UFC 137: Nick Diaz no-shows media event, strands Georges St. Pierre in Toronto

Where in the world is Carmen Sandiego Nick Diaz?

Well, we know where he isn't -- at a scheduled media appearance to hype his UFC 137 title fight against Georges St. Pierre on Oct. 29 in Las Vegas.

The Winnipeg Free Press explains:

The UFC offered no reason for Diaz's absence in Toronto but the former Strikeforce champion is no fan of such media events.

St-Pierre said he did not know what was going on in Diaz's life, so he was not going to speculate on the California fighter's reasons for not joining him to hype their Oct. 29 fight in Las Vegas.

But the 30-year-old champion from Montreal says it's a little unfair in that he interrupted his training for the press tour.

Anyone surprised? Diaz has a history of being media unfriendly, even threatening to slap a few reporters who try to step up and do him dirty.

The Stockton, Calif., native, who recently scored an improbable come-from-behind victory via first round technical knockout over British striker Paul "Semtex" Daley back on April 9, is riding a 10-fight win streak where he's finished all but one of his opponents in dominating fashion.

The GSP fight will be the first time Diaz has competed under the UFC banner since a Nov. 2006 win over Gleison Tibau and he hasn't fought in Las Vegas since Feb. 2007, a submission win over Takanori Gomi (later overturned to a no contest thanks to a failed drug test) under the Pride banner.

Will he make a triumphant return to "Sin City?" Or wilt under the constant takedowns of his Canadian foe?

And how does the promotion hold him accountable for his media appearances until then?