Child killer Derek Percy maintains silence on schoolgirl Linda Stilwell's murder CHILD killer Derek Ernest Percy should assist police in the case of murdered schoolgirl Linda Stilwell, Chief Commissioner Ken Lay says. Mr Lay said he was not aware of a Coroner's Court hearing reportedly held at the bedside of Victoria's longest-serving prisoner over the weekend. But he said police were working on the "very complex" case and urged Percy to cooperate. "Obviously it's desperately sad for the (Stilwell) family, they're looking for closure, and I would hope that we might be able to provide that if Mr Percy was willing to help us with some inquiries," Mr Lay said. Percy was forced to undergo an 11th-hour death-bed questioning at the weekend over the abduction and death of schoolgirl Linda Stilwell. Family fears Percy will take secrets to his grave The family of one of Derek Ernest Percy's suspected victims has requested a court hearing at his bedside.