2004 Kia Rio Car Stalled and wont restart

I was driving down the road at about 65mph. All of a sudden the car stalls and won't restart. Had enough momentum to pull off to safety. Have a full tank of gas, pulled the battery and had it checked and it was fine. Pulled out the starter and had it checked and came back fine. All I get when i turn the key in the ignition is one single click and nothing else. No idea what else could be going on.