1997 Chevy S-10 My truck wont start

I was driving and everything was running normal when all of a sudden my truck just shut off and died. No kicks, no sputters, nothing unusual. Was almost as if somebody just turned it off. I had just filled up with a full tank of gas 2 hours earlier and was only driving 15 miles. All of the electrical components work normally, however my truck wont start. It cranks over properly and sounds great but wont catch and start up. Starter is good, battery is great. I first thought the fuel pump/filter, so I replaced both. Still wont start up. I pulled a spark plug and kept the wire on it and had somebody crank the motor and looked for a spark. I couldn't see one at all. So I thought maybe the crankshaft position sensor. I replaced it and no luck. I am seriously at a loss here and I have no clue what could be causing my truck to not start up.