2003 Sedona wont start

I have a 2003 Sedona w/ 82,000 miles. It started fine and I drove it
about three blocks in the morning. Next time we drove it started fine
and then suddenly the engine died w/o notice.
The alternator was replaced at about 45,000 miles due to a
manufactuars fault on the original alternator. I am thinking it is an
alternator problem again because the battery has drained fully now
that it has been sitting. However we charged the battery and jumped
it, it will try to turn over but wont ignite. All of the belts apear
to be intact, it has had religous oil changes.
Could this be the alternator or possibly spark plugs, fual pump or
another problem.
Any information you can give would be greatly appreciated!

Thanks!