Sheriffs at the Edmonton courthouse admitted they were wrong to shield child-killer Lily Choy from the public, says homicide detective Bill Clark.

Choy, 37, was convicted of manslaughter Wednesday for killing her three-year-old foster child in January 2007.

After the trial, sheriffs agreed to whisk Choy out a back door, far from waiting media.

That angered Det. Bill Clark who immediately filed a complaint.

"She not only gets to walk out but they take her in the back and they're going to sneak her out a way that the public doesn't get to see her?," he said.

"Why do people like that get special privileges? I don't understand that. It's very upsetting to me."