BOSTON -- A Massachusetts State Police officer who was fired over his conduct during the investigation into the murder of Boston police officer John O'Keefe appeared before the state's Civil Service Commission on Tuesday as he appeals his firing.

Former Massachusetts state trooper Michael Proctor, the lead investigator in the case, delivered damning testimony during Karen Read 's first criminal trial over the murder of O'Keefe, her boyfriend at the time, including derogatory and sexist text messages Proctor sent friends about Read.

During the trial, it was also revealed that Proctor disclosed confidential information related to the murder investigation to friends and family members.

After Read's first trial ended in a mistrial , Proctor was suspended without pay and relieved from

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