Aurora :: 2001 3.5 V6 Won't Turn Over

I have a 2001 Oldsmobile Aurora 3.5 V6. Last Thursday, I started it cold, drove it about 500 feet, and it just stalled. I didn't lose power or anything, it just stalled; I did lose power steering though. Something that may work is that the battery light came on and started flashing when the car stalled, and continued to flash when i attempted to start it.

The car cranks, it just never turns over. I do not lose power like the battery is draining when I attempt to start it (The dummy panel shows the battery dropping to 11.7V, and returning to 11.9/12V when I stop trying to turn it over. I can do this for 15 seconds at a time (It automatically stops trying to turn after 15 seconds) for a long time, and the battery never drains, so it is as if it is charging as I am trying to turn it over. (Not sure if that is important to note or not).

I had it towed home, did nothing to it other than try and start it (which didn't work). Let it sit the weekend, and it started with no issues Monday. Drove it to work, almost made it, and the same thing happened. Same exact thing, battery light came on and started flashing, and the car stalled. Had it towed back again, and it hasn't started since.

I have checked all fuses and relays, nothing shows signs of failure there.

When I turn the key, I can hear the fuel pump getting power also.

Here is what has happened to the car in the past year (excuse me if too much detail is included):

Replaced the Alternator
Replaced the Starter
Replaced all break lines
Replaced all brake pads, rotors, calipers, bearing/hub
Replaced fuel line

I have not tested the fuel pressure, because I do not have a tool to do so.