Prosecutor Peter Wright QC told the Old Bailey that the couple, who had three children together, divorced in 2014 after their arranged marriage came to an end. She subsequently began a relationship with Mr Muhammad, who moved into the house. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. An embittered former husband plotted for more than a year before shooting dead his heavily pregnant ex-wife with a crossbow in a “calculated act of revenge”, a court heard yesterday.Ramanodge Unmathallegadoo nurtured a “deeply held desire for a most violent revenge” after his wife Devi left him and went on to marry another man.The 51-year-old amassed a cache of deadly weapons at the bottom of her garden before launching his attack in November last year.His former wife, who had changed her name to Sana Muhammad after re-marrying and converting from Hinduism to Islam, died from devastating internal injuries, the Old Bailey heard.Her unborn baby boy survived after being delivered by Caesarean section. The crossbow bolt is thought to have missed the baby by just a few inches.The jury at Unmathallegadoo’s murder trial was told that he launched his attack after plotting over the course of a year to kill Mrs Muhammad and her new partner, Imtiaz Muhammad, who she had met when came round to decorate the kitchen of their family home in Ilford, east London. Ramanodge Unmathallegadoo denies murdering his former wife, Sana Muhammad Credit:Facebook Unmathallegadoo, formerly of Ilford, denies murder and the attempted destruction of the unborn child. Here he shot his former wife as she fled upstairs in terror.Mr Wright said: “Imtiaz saw the defendant, who was at the bottom of the stairs, shoot Devi who was halfway up the stairs. The effect on her was immediate and she fell to the floor.”The court heard that after Unmathallegadoo was restrained and disarmed by two of his older children he told them: “It would have been easier if you guys weren’t here, like I would have done it.”Unmathallegadoo later claimed he had shot his former wife by accident and had intended to kill only Mr Muhammad.But Mr Wright suggested the evidence would show that Mrs Muhammad, 35, was the “principal target”.”This was a quite deliberate and calculated act of revenge on his part intended to cause at the very least the death of Devi and the extinction of the child she carried,” he said, adding that Unmathallegadoo ‘had every opportunity’ to shoot Mr Muhammad as he pursued him through the house, but “needed to conserve his readily available fire power”.Mr Wright said the timing of his positioning himself in the shed was “no coincidence”, adding: “This attack was designed to take place before Devi gave birth to her child.” The prosecution claimed his plan was to restrain and then kill his ex-wife and Mr Muhammad, along with their unborn child.But jurors heard he was disturbed by Mr Muhammad who had gone to the shed to store a box.Mr Muhammad fled back to the house to raise the alarm, followed by Unmathallegadoo carrying the two crossbows. Sana Muhammad, shot dead with a crossbow in front of her husband and childrenCredit:Facebook Unmathallegadoo, a former site manager at Newham General Hospital in east London, had “not reacted well”, said Mr Wright.By November 2017 he allegedly began to store equipment in an electricity stub-station close to his ex-wife’s house as a means of carrying out his warped mission, including two crossbows and numerous bolts.The cache was discovered by chance by a neighbour in March 2018 and removed. However, Unmathallegadoo spent £2,000 buying new equipment, while also carrying out surveillance of the home in Newbury Park, Ilford, in order to establish the comings and goings of family members, the court heard.By the morning of November 12 2018, he had taken up position in a shed at the bottom of his wife’s garden, armed with two crossbows, bolts, a hammer, a knife in a home-made sheath, cable ties and duct tape, awaiting his moment to strike.