Ex-science teacher, 36, 'researched suicide methods online then drowned her three-year-old daughter in the bath after becoming paranoid that her company director husband was having affair with work colleague' Claire Colebourn drowned her daughter at home in Hampshire, court hears Bethan was rushed to hospital after emergency services were called out Former science teacher Colebourn, 36, denies the single charge of murderBy Terri-ann Williams For Mailonline Published: 13:14 GMT, 7 March 2019 | Updated: 13:32 GMT, 7 March 2019 A mother 'researched suicide methods online and then drowned her three-year-old daughter in the bath after becoming paranoid that her husband was having an affair'. Claire Colebourn today sobbed in the dock at Winchester Crown Court as the prosecutor told how she thought her husband Michael, a company director, was having an affair with a work colleague. The 36-year-old searched suicide methods shortly before allegedly drowning little Bethan in the early hours of the morning at their £400,000 family home in Hampshire. She appeared before a High Court judge today as prosecutor Kerry Maylin opened the case involving the murder of Bethan. Bethan (pictured above) was described as a 'fun-loving' little girl by her family Claire Colebourn believed that her husband Michael Colebourn (pictured above) was having an affair Police at the scene in Fordingbridge after Claire Colebourn 'drowned her daughter Bethan' Bethan was rushed to Salisbury District Hospital, Wiltshire, on October 19 last year, after emergency services were called to the converted bungalow in Fordingbridge. However, the 'fun-loving, adventurous' little girl was tragically pronounced dead at hospital. The court heard that Colebourn had endured a painful divorce from her husband Michael, after she became convinced he was having an affair with a woman named Kelly, a financial director at their company, Ms Justice Johannah Cutts heard. Colebourn, whose husband Michael works as chief executive officer of luxury marine interior company Trimline, had previously broken down in tears at her hearing in July 2018. Tributes which were left outside of the property in Hampshire after the death of Bethan Three-year-old Bethan's family said she would be 'dearly misses'. Pictured above police outside the family home At the time of Bethan's death heartbroken Mr Colebourn paid tribute to his daughter. In a tribute, released by the family, they said: 'Family and friends are devastated at our tragic loss. 'Bethan brought so much happiness and joy to so many people's lives. 'Bethan was a fun loving, adventurous and caring young girl who will be dearly missed. 'She will be in our hearts and minds forever.' Police parked outside of the £400,000 converted bungalow in Hampshire, where tributes were also left The trial is being heard at Winchester Crown Court (pictured above) where Claire Colebourn has denied the single charge of murder On 26 July 2018 Judge Keith Cutler remanded Coleburn in custody. The court heard the trial, which will be heard by a high court judge, will last up to three weeks. Judge Cutler said: 'This is the case of Claire Colebourn, who faces the charge of murder of Bethan Colebourn, her three-year-old daughter. 'She has pleaded not guilty. 'This is a terrible and tragic case, which needs full investigation and I completely support the work being done to contact a number of experts. 'It has been decided that this case should be tried before a high court judge, but the availability is very limited. 'In the circumstances, we have a full slot for this trial beginning March 5, 2019.' The former science teacher denies the single charge of murder. Share or comment on this article: Sorry we are not currently accepting comments on this article.All rights reserved for this news site dailymail and under his responsibility