Suspects Season 3 (2015)

Art teacher Abigail Lincoln is found dead at the sixth form college where she worked by handy-man Harry Webster, a man with a conviction for violence, who had recently been sacked for harassing Abigail for being a Lesbian. At the same time Charlie learns that Abigail was about to report the principal, Rory O'Hanlon, for having an affair with student Melissa Parker whilst Rory's stepson Dylan had been sending Abigail abusive texts. Melissa is caught on CCTV disposing of the murder weapon but there will be another death before the police solve the case.