How to remove/update the Secondary Contact in an incident using CPM?

Hi,

I am trying to remove the secondary contacts from an incident for a certain contact once that contact's primary email id is changed, I am able to successfully update the email if of a contact, but somehow facing difficulty in removing the secondary contact from all the incidents of that particular contact.

For example -

I have a contact with email id [email protected] and it has 3 incidents,

then I want that whenever the primary email for contact changes from [email protected] to [email protected], all the incidents of that contact, should remove the secondary contact from them.