A Hamilton police sergeant who has admitted to inappropriate sexual relationships with women connected to his cases is facing new disciplinary charges for another alleged relationship with a witness.

Derek Mellor, a veteran investigator who headed the service's first human trafficking unit, appeared before a Police Services Act hearing Wednesday morning.

He is charged with two counts of discreditable conduct. The first is for an alleged sexual relationship with a witnessin a domestic violence case he investigated in 2000. The second is for allegedly showing up at that witness's workplace and acting in a "disorderly manner."

The alleged incidents took place between Aug. 27 and Nov. 30, 2000 — more than a decade before he led the service's inaugural human trafficking unit. At the time, he was working as a uniform patrol officer.

Mellor was a 14-year veteran officer in Hamilton at the time of his suspension in December 2012, at the outset of the internal investigation into his conduct with women. He spent much of his career with the vice and drug unit.

On Wednesday Mellor appeared clean shaven, head shaved and wearing a black suit. He did not enter a plea on the new charges.

Mellor sat next to his lawyer, his posture stiff and his back turned to the media throughout the short proceeding.

Outside of the hearing Mellor's lawyer, Leo Kinahan, said he had not yet received disclosure and didn't know details of the allegations.

Mellor previously pleaded guilty to nine discreditable conduct offences, admitting to inappropriate sexual relationships with women connected to his human trafficking work.

The offences include sex and sexting with a witness and a victim's mother in a human trafficking case. They also include sexting and sexual advances with human trafficking outreach workers and sex trade workers he met through his human trafficking work.

It was also announced Monday that he is the subject of a criminal sexual assault investigation by the Special Investigations Unit. The case centres on one of the women who came forward to police in the first disciplinary matter.

Kinahan said he knows nothing about the scope or nature of the SIU investigation and therefore can't comment. He doesn't know whether the criminal case will impact the disciplinary hearings.

The multiple investigations and charges over the past two years have been "very stressful" on Mellor and his family, Kinahan said.

"There has been a public perception put out there by a number of individuals that I don't believe is accurate," he said. "He's been through a lot, he's been through hell."

Kinahan wouldn't comment on details of Mellor's relationships with the women.

In Canada, sexual assault can include where a victim doesn't resist but the perpetrator is exercising authority.

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The hearing into the new Police Services Act charges will resume by conference call on the morning of Nov. 4.

The sentencing hearing on the nine disciplinary charges Mellor has already pleaded guilty to resumes Sept. 29.