A DOUBLE killer gasps "you're joking" after being held for murdering his first wife in a chilling echo of his arrest for killing his fiancee.

       Black Widower Ian Stewart can be seen smirking in the back of a cop car after officers told him he was arrested for murdering Diane Stewart.

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       Ian Stewart smirked as he was arrested for murdering first wife Diane 8

       The monster gasped 'you're joking' at cops 8

       Similar footage shows Stewart being arrested for murdering Helen Bailey 8

       He was still wearing his dressing gown as he again gasped 'you're joking'

       The monster gasps "you're joking" before muttering: "Ooh f**k you're digging desperate".

       As an officer continues to read his rights, Stewart adds: "Oh for f**k sake, what a load of ********".

       Stewart adds: "Have you got nothing better to do than make things up?"

       He then shakes his head and smirks while looking out the car window.

       Stewart was later filmed in a police cell shrugging when he was asked about Diane's death.

       The footage bears a chilling similarity to bodycam video taken when Stewart was arrested for murdering fiancee Helen Bailey.

       Again he weakly gasped "you're joking" as police swooped on Helen's ￡1.4million home.

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       The body of the children's author was found in a cesspit filled with human excrement in her garage in 2016.

       Evil Stewart had smothered his fiancee in a murderous plot to get his hands on her ￡4million fortune.

       It wasn't until he was caught that it emerged the software engineer had killed his first wife Diane Stewart.

       Her death in 2010 had been pinned on her epilepsy but a new investigation found she had been either strangled or suffocated.

       Stewart was today convicted of murdering Diane following a trial at Huntingdon Crown Court.

       He will now die behind bars after being handed a whole life tariff.

       Sentencing, Mr Justice Simon Bryan slammed Stewart for a "concerted and callous charade" and pointed out the "striking similarities" in both gruesome murders.

       He added: "You murdered Helen Bailey a lady with whom witnesses in that trial, and in this trial, said you were very much in love with and indeed about to marry just as you murdered Diane whom you also said were you very much in love, as again attested by many witnesses."

       Diane's brutal death came six years before the monster murdered Helen.

       Bodycam footage was released in 2017 after Stewart was convicted of smothering the author.

       It showed Stewart barefoot in his dressing gown being confronted by cops in a dawn raid.

       He stutters "bloody hell, why?" and "where is she?" after being told officers had a search warrant for the home.

       The monster also repeatedly asks why the garage door was open after he dumped Helen in the 14ft deep cesspit.

       He had failed to disclose the house had a second cesspit under the garage and parked Helen's car over the covering.

       But police found her decomposing body alongside beloved dog Boris and a dog toy.

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       Stewart murdered first wife Diane Stewart 8

       He killed Helen and her dog Boris six years later

       Stewart was jailed for life with a minimum of 34 years after being found guilty of murder.

       He will now likely die in prison after jurors convicted him of murdering Diane.

       Police had begun re-examining her death after Stewart's conviction as her family revealed they harboured concerns about him.

       An inquest found she suffered a “sudden unexpected death in epilepsy” when she collapsed in the back garden.

       Just like from his second lover's death, the fiend stood to inherit money from Diane's passing - this time ￡96,607.37 from her bank accounts and ￡28,500.21 from a life insurance policy.

       How you can get help

       Women's Aid has this advice for victims and their families:

       Always keep your phone nearby. Get in touch with charities for help, including the Women’s Aid live chat helpline and services such as SupportLine. If you are in danger, call 999. Familiarise yourself with the Silent Solution, reporting abuse without speaking down the phone, instead dialing “55”. Always keep some money on you, including change for a pay phone or bus fare. If you suspect your partner is about to attack you, try to go to a lower-risk area of the house – for example, where there is a way out and access to a telephone. Avoid the kitchen and garage, where there are likely to be knives or other weapons. Avoid rooms where you might become trapped, such as the bathroom, or where you might be shut into a cupboard or other small space.

       If you are a -victim of domestic abuse, SupportLine is open Tuesday, Wednesday and Thursday from 6pm to 8pm on 01708 765200. The charity’s email support -service is open weekdays and weekends during the crisis – messageinfo@supportline.org.uk.

       Women’s Aid provides a live chat service - available weekdays from 8am-6pm and weekends 10am-6pm.

       You can also call the freephone 24-hour -National Domestic Abuse Helpline on 0808 2000 247.

       But in a "stroke of luck", Diane had donated her brain for medical research and brain tissue was also kept.

       Scientists were able to use this to find her chances of dying from epilepsy were more than one in 100,000.

       Despite Stewart's claims his wife was plagued by the condition, she had not suffered a seizure for 18 years and it was an "extremely low" chance her "mild" epilepsy killed her.

       Even more sinister, a pathologist found the death was most likely caused by "a prolonged restriction of her breathing from an outside source".

       The oxygen to her brain had been "substantially reduced" in the hour before her collapse - leading experts to believe she had been either suffocated or strangled in a chilling echo of Helen's killing.

       'MASTER MANIPULATOR'

       Detective Superintendent Jerome Kent led the investigations into both Helen and Diane’s deaths. He said: “My thoughts and those of the investigating team are with Diane’s family at this extremely difficult time.

       “Both Helen and Diane were extremely talented women who had their lives taken by a man who skilfully controlled them both in the same way by playing on his own frailties and needs. He is a calculated killer who planned his attacks to coincide to times when others were away from the house, and he was alone with his victim.

       “He is so much a master manipulator, he had the ability to convince agencies of his innocence and kept the truth of what happened from family and friends, keeping those lies going over months and years as well as through the court process.

       “In each case, no reports of domestic abuse or concerns about coercive behaviour were reported to any agency. It is often the case that perpetrators are powerful and subtle in their ability to control.

       “There is no typical victim of domestic abuse. The fact is it can happen to anyone. We investigate reports of domestic abuse or homicide equally, regardless of age, sexual orientation, race, ethnicity, class or gender. Where cases are identified, those who are suffering domestic violence or coercive control should be reassured we are determined and relentless in our pursuit to bring offenders to justice, even years down the line.”

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       Helen's body was found in the cesspit Credit: PA:Press Association 8

       Stewart will likely die behind bars