Silent Witness is on BBC1 at 9pm.

In this week’s two-part case, forensic pathologist Nikki uncovers a US government secret after an American diplomat is shot dead in London. Continues tomorrow.

Next of Kin is on ITV at 9pm.

In part three of the thriller, Mona returns to the UK determined to investigate nephew Danny’s suspected terrorist links but her efforts have unexpectedly consequences.

Surgeons is on BBC2 at 9pm.

The documentary series concludes with a look at medical staff and patients who are undertaking clinical trials at the Queen Elizabeth Hospital Birmingham.

Inside the Ambulance is on W at 9pm.

The return of the daily documentary series, which explores the work of UK paramedics, begins with emergency workers rushing to the aid of a man struggling to breathe.

Murdoch Mysteries is on Alibi at 9pm.

Inventor Alexander Graham Bell assists in a murder investigation in this week’s episode of the period drama set in turn-of-the-twentieth-century Toronto.

Extraordinary People is on Channel 5 at 10pm.

This documentary follows a young British woman with dwarfism as she travels to the United States in an effort to get her condition fully diagnosed.