A Hamilton pediatrician sentenced to eight months in jail for sexual assault has been arrested on a new set of charges.

Dr. Daniel Marshall was arrested Wednesday morning and charged with sexual exploitation, sexual interference and two counts of sexual assault.

The 56-year-old was in John Sopinka Courthouse waiting to be sentenced at the time.

According to a release from Hamilton police, the allegations were "recently" brought forward by two former patients. Both complaints stem from incidents that took place in 1990.

Police also said the investigation is ongoing.

At a lengthy and emotionally charged trial this spring, Marshall was convicted of sexually assaulting a teenage boy. He was also acquitted of numerous other charges of sexual assault and sexual interference involving 20 of his former patients.

Once he was processed on the new charges, the heavy-set physician shuffled into court in shackles to receive his sentence.

In addition to an eight-month jail term, he was handed two years' probation.

The Crown sought a 12- to 15-month jail sentence for the longtime doctor - a penalty Superior Court Justice R.B. Reid said was "excessive."

However, the judge also noted the defence's recommendation - a 12- to 16-month conditional sentence served in the community - was inappropriate in this case.

"I am not satisfied that the principles of deterrence and denunciation would be adequately addressed except by a period of regular incarceration," Reid explained.

Clad in a black suit and yellow shirt, Marshall stood silently as his sentence was read out in the cavernous sixth-floor courtroom. His wife and parents - joined by about a dozen onlookers - were likewise still.

Following a brief appearance on the new charges in front of a justice of the peace Wednesday afternoon, Marshall was remanded in custody. He's expected to be back in court Thursday morning for a bail hearing.

Assistant Crown attorney Janet Booy declined to comment on the sentence, and said she knows nothing about the new charges.

Marshall's lawyer, Jenny Stephenson, wouldn't speak to either the sentence or the fresh allegations. She did, however, say in court Wednesday she plans to appeal her client's conviction.

Marshall, a specialist in treating behavioural disorders such as ADHD, is also under investigation by the College of Physicians and Surgeons of Ontario - the regulatory body for doctors in the province.

While the college hasn't banned Marshall from practising, his licence was restricted following the original charges in 2010.

He's since been required to have another medical professional present any time he examines a patient under 18.

Marshall was also cautioned by the college in both 2002 and 2006 after patients complained about the manner and frequency of his genital exams.

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During his trial, Marshall testified he examined his patients' genitals as often as four times a year.

Marshall said the exams were necessary to monitor his patients' growth, which could be affected by some of the medications he prescribed.

College spokesperson Prithi Yelaja said in an email Wednesday that in addition to the investigation and existing restrictions, all court findings will be reviewed to determine if further action, such as a disciplinary hearing, is appropriate.