The question no one can answer is why he was walking on this road pulling a roll aboard suitcase, carrying a duffle bag and a sleeping roll. Was there camping further up this road? I'm not familiar with Red Rock Canyon.
I read another article where one of the cyclists said he had seen the guy waving at them as if he was trying to stop them, but they kept going. "I thought about it later after I heard he had been shot. Maybe he just wanted some water."
A lot of unanswered questions!