Law & Order: UK S04E03 - ID

When a pregnant junior doctor, Alice Cullen, is found beaten to death in the car park of the hospital where she works, the prime suspect becomes her boyfriend, who cannot provide a solid alibi for where he was at the time of the killing. Mobile phone traces put him in the right place at approximately the right time, but when his therapist provides him with an alibi for that evening, DS Devlin and DS Brooks begin to suspect they are having an affair. On arrest, what initially seems like a crime of passion soon unravels into a conspiracy involving senior level government officials. Risking their careers and defying the instruction of the Director of Public Prosecutions, James and Alesha must get to the bottom of this case before another life is destroyed.