Heaton, wearing a peach shirt, leaned against the wall of the prisoner's box and yelled at the court through a gap in the glass.
What Heaton yelled cannot be detailed, due to a publication ban on evidence disclosed at the hearing. Responding to Heaton's outburst, the judge advised him to be quiet, and avoid addressing the court directly.
Heaton, 25, is charged with seven counts, including aggravated sexual assault, breaking and entering, robbery and unlawful confinement.
He has at least 40 criminal convictions in Ontario, including aggravated assault, break and enter and possession of a weapon.
Heaton has been in custody since his arrest six weeks ago.
Violent sex assault
The assault in question took place on March 26, when a man armed with a weapon barged into a woman's home just after noon, tied her up, choked her using clothing, and sexually assaulted her with a rock and a knife, according to court documents.
Her attacker — who she didn't know — was stopped by another man who heard her screams and rushed into the house to help. Several other people came to her aid, and the suspect was held until police arrived.
The woman was taken to hospital with what police called "significant" but not life-threatening injuries, and has since been released.