The fuel pump may fail causing the engine to stall and not restart.Google+
Car Problem Reports
Cadillac DTS Replace Fuel Filter Every 30,000 to Prevent Fuel Pump Failure
Cadillac DTS Problem
Average Mileage: 80,000 mi (60,000 mi - 110,000 mi)
Visitor, 2008 Cadillac DTS, 63,000 mi
The car would not start. Took it into the dealership and they told me that it was the fuel pump. They specifically said that it overheated and also damaged the relay.
Visitor, 2008 Cadillac DTS, 110,000 mi
Starter tries to start but will not fire car. This occured without any previous signs of a problem.