rudd , 60 , was charged with two counts of threatening to kill and possession of methamphetamine and of cannabis .
the veteran rocker had originally pleaded not guilty to the charges .
but with his judge-alone trial due to begin on tuesday , in the tauranga district court , his lawyer changed his plea to guilty .
the case has been adjourned until june 26 when rudd 's lawyer will apply for a discharge without conviction .