Audit on deleting a record

I am auditing security group field on operator table

This is what i have done so far

Turned Audit On
Created auditspec entry
Created 3 triggers
2 - After Add, 4 - After Update, 5 - Before Delete, with the application as "trigger.invoke.auditor"

Audit record is generated when a new operator record is created, when an operator record is modified, but not when an operator record is deleted. I would like to audit the security group field when an operator record is deleted.