1. Suicide or Murder? (1)

When Jo is found stabbed at home, her husband is arrested. As forensic evidence and witness accounts are examined, detectives grow highly sceptical of his story.

3. The DPD Murder (4): Killers on the Run

Detectives hunt the remaining suspects in the murder of Aurman Singh. Financial data and international cooperation lead detectives to two fugitives hiding in plain sight in Austria.

4. Killer in the Home

Chris Hemming calls police to confess he has stabbed his ex-partner to death. DCI Gareth Lougher must now establish whether this was premeditated murder or manslaughter.

5. Natural Born Killer (1)

When 54-year-old Jamie Gawler is found dead in his Hereford flat, DCI Gareth Lougher's team piece together his final days. But a suspect's phone yields a shocking new revelation.

6. Natural Born Killer (2)

Phone evidence reveals the brutal extent of Matthew Jonathan's violence against Jamie Gawler. Meanwhile, the Vulnerable Persons Unit investigates a near-fatal assault in Telford.