Helen Bailey

Residence of Helen Bailey, 23 July 2016

At the trial in January 2017, the prosecution alleged Stewart had secretly drugged Bailey with zopiclone sleeping pills for several months before suffocating her.[29] It was subsequently alleged that she may still have been alive when dumped in the cesspit.[30] During the trial, the prosecution claimed that Stewart had inadvertently connected Bailey's mobile phone to the WiFi router in the couple's holiday home in Kent when he visited it the day after reporting her missing, an event which prosecutor Stuart Trimmer called 'very significant'.[31] The jury was later told by Bailey's brother that during his only visit to her home in Royston she had joked about the cesspit in the garage being a "good place to hide a body", and that the remark had been made in "full earshot" of Stewart.[32] The members of the jury subsequently visited the site where her body had been discovered.[33] They also heard that it was alleged by the prosecution that Stewart had twice attempted to use power of attorney to sell a flat owned by Bailey; these attempts included one on the afternoon of the day on which she went missing, when he told the solicitor dealing with the sale that Bailey was too unwell to attend in person.[34] The jury heard that on the day she vanished Stewart increased a standing order to transfer money from Bailey's bank account to their joint account from £400 to £4,000 per month. The jury learned Stewart was the main beneficiary of Bailey's £3.4 million estate, and would also benefit from a large life insurance policy.

The jury was played a recording of Stewart's telephone call to the police in which he reported Bailey missing;[35] when asked to describe her he could not recall the colour of her eyes, had to look up both her mobile phone number and date of birth, and was unable to give the address of their holiday home in Kent.[36]

Helen's mother Eileen Bailey testified that Helen had been concerned that she was sleeping excessively, and about her state of mind. The prosecution stated that traces of anti-insomnia medication had been found in Bailey's body.[37]

Giving evidence in his defence, Stewart claimed that Bailey and her dog had been kidnapped on 11 April 2016 by two men called Nick and Joe, saying that he had not told the police about this "to keep Helen safe" and that the kidnappers had demanded a ransom of £500,000.[38] He said that he had spoken to her for the last time on a mobile phone belonging to one of the men on 15 April.[38] He was subsequently presented in court with two men who the prosecution alleged he had based the descriptions of the kidnappers on: Nick Cook, Stewart's next-door neighbour, and Joe Cippullo, whom he knew from his former home in Bassingbourn.[39] Stewart admitted to knowing both men, but denied that they matched the descriptions of the kidnappers which he had given to the police, saying "they don't compare at all".[39]

The jury heard of several sightings of Bailey after the time at which the prosecution alleged that the murder had taken place. One of Bailey's neighbours gave evidence that she had seen the author walking her dachshund Boris "between 15:40 and 15:50" on the day of her disappearance. Two other neighbours said they had seen her walking her dog that day between about 13:20 and 14:20.[40] A further witness claimed to have seen Bailey in Broadstairs after her alleged murder, but admitted under cross-examination that he had not thought about the sighting until a journalist from The Sun had interviewed him; he accepted that the sighting could have been in March, before Bailey was reported missing.[41]

In his closing statement, prosecutor Stuart Trimmer QC told the jury that Stewart's version of events was "quite absurd" and that the accused had "grossly deceived" Bailey, saying: "It is perfectly plain she was completely overwhelmed by what some people might call 'love bombing'. […] It is a matter of common sense and knowledge that someone shortly bereaved might not have the logical equipment to see she was being deceived."[42] In response, Simon Russell Flint, the barrister acting for Stewart, dismissed the prosecution's "highly speculative theories", and asked, "What possible motive could he have?"[42]

On 22 February 2017, the jury found Stewart guilty of Bailey's murder.[43] At St Albans Crown Court the following day, Judge Andrew Bright sentenced Stewart to life imprisonment with a minimum term of 34 years,[44] meaning he will be 90 years old when he becomes eligible for parole. Stewart was not in court to hear his sentence.[45]

The detective who led the murder inquiry called Stewart a "greedy, wicked narcissist".[46] Neighbours related episodes when Stewart revealed volcanic rages.[47] Members of Stewart's former bowls club recalled how he was "obsessed with money" and extremely parsimonious: he accounted for every penny he spent or was owed, he caused a scene at a bowls match when asked to pay for a cup of tea as he argued that it should have been covered in his membership fee, he refused to chip in a few pounds for unforeseen repairs to the bowling green for the same reason, and he refused to participate in whip-rounds for colleagues' birthdays.[48]

Stewart was the subject of the first episode of the true crime drama What The Killer Did Next, broadcast in February 2019[49] and presented by Philip Glenister.[50][51]

Following Stewart's conviction, the police began to re-examine the death of his first wife, Diane, in 2010.[52] On 21 August 2018 he was arrested and questioned on suspicion of her murder.[53]

Subsequently charged with his wife's murder, Stewart appeared at St Albans Crown Court on 6 July 2020. He was remanded in custody until a plea hearing scheduled for 21 September 2020.[54][55]