One solution comes to mind.
Write a script that launches the critical script, and does something when it is no longer running.
#!/usr/bin/perl -w
use strict;
print "script started!\n";
my $result = system "critical.pl";
# if it comes here, then the script has died.
print "critical.pl is no longer running. (Exit code $result)\n";
#perhaps add code to send a mail to your address
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