A former Liberal candidate and decorated police officer has pleaded guilty to serious sexual offences against two female victims.

Mark Steven Rose, who failed to win a seat in a 2010 state byelection, began to weep loudly after he admitted three charges in the County Court on Tuesday.

Mark Rose pictured in 2010. Credit:Penny Stephens

The court heard the former police sergeant sexually penetrated two victims in incidents in July and August 2018.

The identity of the victims and details of the crimes cannot be disclosed for legal reasons.