Da Vinci’s Inquest - Season 6 Episode 6

Kosmo and Leary investigate the death of Sarah Peters, her body found in the underground parking lot of her apartment building. They learn from William Chen that Peters was a material witness for the Crown in the homicide case against Roy Willetts. Chen also tells them that Willetts was incarcerated with Peters' estranged brother, Gary. Kosmo later also learns from Sue that someone is selling merchandise purchased with Sarah Peters' credit card. That someone is Dennis Lucas, who Kosmo and Leary pick up. Lucas admits that he knows who killed Sarah, but that the killer was hired by Roy's mother, Tammy. Lucas plea bargains – he'll help Kosmo and Leary trap Tammy into confessing. Meanwhile, Da Vinci and Shannon investigate the death of William Mattucci, who was found dead of stab wounds to the chest. According to his wife, he had a history of attempted suicides; the knife in his hand would indicate he took his own life. By circumstance, Constable Thurman notices blood stains in the bathroom of the Mattucci's downstairs tenant, Lena Whelan. The blood stains end up being more than meets the eye, which Whelan knows as she runs off during the investigation. The authorities find Whelan, who tells a story of domestic problems both in the Mattucci household and her own household which led to Mattucci's accidental death. Elsewhere, Da Vinci speaks to Joan Hanes, a witness in Darcy Charles' assault. Sue continues to assist Kosmo and Leary on the sting against Curtis. And Claire advises Da Vinci on a way to proceed with the safe injection site proposal, however it compromises his want for the Red Light District, at least for the immediate future.