I have a 2007 Audi A4 sedan. One day, while I was driving, the warning light Low Oil Pressure flashed on. I thought maybe I needed oil. I checked it and added a quart. The next morning after driving a couple of miles, it came back on. So, I drove it back to the house. It didn't make it. It shut off and warning beeps started sounding off. What is the problem. Never experienced this before.

well, if you had low oil pressure and the engine stopped running because of that, engine now has srrious internal damage. Have a pro check the FIRST

Have a pro check what? Check the engine?