You have posted that:
"I was the person who has confirmed he works with me"
If in fact, he was working with you and you confrmed it then, it is fact.
Have you made a wrong statement?
Apparently you have no liability.
Still the Bank is under obligation to confirm to the family of deceased about (master) insurance policy (if any) thru bank and supply authenticated copies of CC issuance form and statements with signed charge slips, Personal loan offer/brochure/loan application/loan approval/loan disbursments/loan agreement/KYC docs collected/loan statements etc.............
Likewise if CC company/bank approached you it is under obligation to supply you authnticated copy of all docs on record.
If decased was Hindu then his son/family has no liablity to pay the debt.
The CC company/bank can proceed to recover from his estate,if any,left by him.