Diesel must have gelled. Car was in a safe place (outside). I decided not to have it towed. Wednesday, when temp was -10F before windchill I tried to start it again (using portable battery jumper, tried cables). Same issue. Would crank but not start. Glow plug light flashing, but wouldn't go off.
I left it until today. Waited until it warmed up to about 20F. Jumped with portable battery. This time Glow plug light was flashing, but started immediately. Was getting other electrical issues like TPMS system not working, etc. Those messages cleared as car ran a bit.
I guess I learned my lesson about using an additive.