Find name of last user to have changed any AD user password

I am curious to know if there is a way to get the username of the person that last changed a password (not necessarily his own).

For example: A regular user (say Gary) forgot his password and calls an admin whose username is ADM_JDOE and who has the right to reset passwords.  How can I find out that the last password change was made by ADM_JDOE (or any other admin) and not by Gary?

Thanks,

SK