X5 died today while driving

[bigx5er]

2008 with 10.5K miles. Had been driving for 10 minutes and exited a freeway. About a minute later while traveling at 45 MPH, the tac jumped to over 3000 RPMs and the accelerator quit doing anything. A few seconds later the engine shut down and I was in the left lane with no power steering. I was able to glide it onto a side street. All attempts to restart failed, it would run for 1/2 second and die.

Just refilled it last night, so fuel was full. It was -6 here, but it has been much colder.

BMW Assist had a tow truck out in 35 minutes and my dealer has it in the queue.

Anyone else experience this? Very scary to go through.