I lost the password to my iMac desktop profile

2 months ago our imac was stolen from our house and only yesterday it was recovered by the police but in the mean time they restarted the computer and made a profile that we do not know the password to. Is there anyway we can restart the computer without having to know the password to it ?

See if you can reset the password using your Apple ID >  OS X: Apple ID can be used to reset your user account password

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