The murder of best-selling author Helen Bailey by her partner Ian Stewart, who had earlier helped volunteers in her search. The 51-year-old's body was eventually found dumped in a cesspit beneath the garage of her £1.5million home in Royston, Hertfordshire, alongside that of her dog in July 2016. She had been drugged and suffocated.

• Nick London

• Kerry Daynes
• Rob Warner
• Cliff Lansley