Alternator probably bad and it might have taken the battery with it. Put a charger on the battery over night and see if it will start without a jump. If it does, monitor the battery voltage over 10 minutes. If it just drops and drops, the alternator is not topping the battery up and its running on the battery alone. If thats the case, pull the alternator and send it for rebuilding at a local alternator shop. You cant buy tii alternators, your choices are either get it rebuilt locally or buy a $400 rebuilt and upgraded one off Ebay.
If after charging the battery all night, the battery is still weak and wont really start the car, the battery has died as well.