Help with Breeze, won't start!

I bought a 1996 Plymouth Breeze with 98200 miles on it. the dealership said they just changed the oxygen sensor. It ran like a beauty, and yesterday i just had an alarm put in. It ran fine after that also. I was driving on the freeway home until my car just turned off. pulled over and it took like 30 seconds to start then it died. Started back up. Drove to the exit got off and it died again pulled into a parking lot and wouldn't start, even with a jump. i put a screwdriver in each plug wire and grounded it and no spark. so what could be wrong?

sounds to me like one of a few things could be the problem here.
the crank shaft posision sensor connections could be lose or the sensor itself it dying/dead
the coil pack is dead
or when they installed the alarm they messge up putting it in and now it is shorting out.