 It'll be up to the medical examiner to determine what killed a Texas man hiking the Grand Canyon, but indications are heat was a contributing factor. Heat cranks up this week in the deserts. As for rain, Ryan Worley with the National Weather Service in Phoenix takes a look at prospects for Tuesday and Wednesday. Chances for storms aren't very high across the lower desert areas. They're only around 5% or so, so we're not looking at...