It should still crank even if the timing belt broke, just not start.
I'd check the starter first, as that is probably the easiest to check, but it shouldn't have caused it to die while running, worst case would br that the motor siezed, but that is unlikely, unless it has been beat on regularly, so most likely it's something electrical, but I have NO ideal on what, maybe just a loss connection somewhere.
I guess I'm not helping matters much, maybe somebody else has some suggestions.
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Huck
Subaru Ambassador
92 SVX LS-Tour Magnaflow Exhaust, 5-Spd-AWD
88 XT6 AWD 5-Speed "Bride of FrankenWedge"
15 Impreza Premium Sedan
15 Crosstrek XV 5-Speed
My 5-Speed "How-To" Write-up
1976 Pontiac Firebird Formula
Current Count of Subaru's Owned.... "70"