Who killed Juan Valdez? Las Vegas police have a suspect, according to the news media.Whoops! Thats the wrong Juan Valdez.The Juan Valdez that VendingMarketWatch is interested in was never party to a street drug deal like the Juan killed Sunday in Las Vegas. Were concerned about the guy with the mule whose image stands for 100 percent Colombian coffee, the one-time gold coffee standard.Where are you, Senor Valdez? You and your mule got lost in the mountains while Starbucks, Peets, Caribou, Green Mountain, Seattles Best Coffee, McDonalds, Dunkin Donuts, Folgers, Millstone, Maxwell House, and others changed Americas relationship with coffee. One hundred percent Colombian coffee is no longer the mark of excellence it was!Dow Jones News recently...