Cannot adleave AD because no AD available

Hello,

I have CentOS servers that at one time were authenticating to corporate's AD domain using Centrify.  The corporate AD is no longer available to our servers in the data centers.  I need to remove the Centrify RPM but cannot because I need to leave the domain first.  Problem is I cannot leave the domain because I cannot reach the AD.  How do I remove the Centrify software from the servers?

Thanks,

Wes