Car shut off while driving now wont start

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Had car warm up for 15 minutes as usual drove 20 km was in an 80 km zone then felt like it was slowing down like when cruise control turns off.it wasn't on either. Pulled over noticed no rpm so tried cranking it and it cranks no start though. Towed it home checked all fuses they are good check spark on all the plugs they are strong. Fuel pump cuts in and out as usual. Can't figure out why she wont start. Battery is full even have a retainer on it so it stays full with all the times trying to crank after each simple test. 2.7 v6 Hyundai tucson 2007