Just to add something,
As per Mexican Regs in order to be PIC of an aircraft with MTOW more than 12500 you need an ATP, and in order to hold an ATP you need to be less than 65 years old. So it looks like this operation wasn't legal from both sides of the border, and there is no night VFR in Mexico, only 10 NM from an airport or in special airspaces like Mexico city.
Whatever the case, very strange accident.
Cheers