Britain's most wanted man is arrested in Romania: Four-year manhunt ends as fugitive, 28, with £50,000 price on head is held after 'knifing man to death in bar then changing his appearance' Shane O'Brien, 31, is the chief suspect in the murder of 21-year-old Josh Hanson O'Brien was on the run for four years and a £50,000 was offered for finding him Mr Hanson was stabbed in unprovoked knife attack in a bar in Hillingon, London The extradition process to bring O'Brien back to the UK will now begin By Isabella Nikolic For Mailonline Published: 16:39 GMT, 23 March 2019 | Updated: 16:43 GMT, 23 March 2019 Shane O'Brien, 31, (pictured) is the chief suspect in the murder of 21-year-old Josh Hanson, who was killed in an unprovoked knife attack in a bar in Hillingdon. He has just been caught in Romania after going on the run four years ago Britain's most wanted man has just been caught in Romania. Shane O'Brien, 31, originally from Ladbroke Grove in London, has been on the run for four years and is the chief suspect in the murder of 21-year-old Josh Hanson, who was killed in an unprovoked knife attack in a bar in Hillingdon, west London. He was stabbed in the neck in front of about 40 horrified onlookers. O'Brien is subject to a European Arrest Warrant on behalf of the Metropolitan Police Service. A £50,000 reward was put on O'Brien's head in 2017, two years after Mr Hanson's murder. O'Brien, who heads the National Crime Agency's 'most wanted' list, was flown out of the UK in a privately chartered plane from Biggin Hill Airport after Mr Hanson's murder. At that time it was believed he could be hiding in the Netherlands. Information later indicated he had travelled to Dubai. In February 2017 he was arrested in Prague for criminal damage and assault, but used the Italian alias of Enzo Mellonceli, supported by false documentation, and was bailed pending further enquiries. Mr Hanson, from Kingsbury, north-west London, died at the scene after the incident at the RE Bar in Hillingdon where he was stabbed in front of 40 onlookers An image taken then shows O'Brien has grown his hair, has a full beard and has a distinctive new tattoo of an owl holding a skull, which covers up his previous 'Shannon 15-04-06' tattoo Mr Hanson lived with his sister, Brooke, and mother, Tracey, in Kingsbury, near Wembley.In an emotional appeal from 2017 his mother said: 'Take a minute and look at your child and imagine your world without him or her…no - neither could have I done before my son was brutally murdered in a totally unprovoked knife attack on 11 October 2015. 'These past 24 months have been a living nightmare, a nightmare that I would not wish on anyone. I nurtured my son from the moment I saw him, held his hand while he took his first steps, handed him his school bag on his first day of school and watched him grow into a bright, capable, funny and loving young man who worked hard and provided for his family. 'We laughed and cried together and shared our innermost thoughts and secrets; he was my son and he was also my best friend.' She added: 'He was my son and he was also my best friend...it rips at your soul and your very being.' The process of his extradition back to the United Kingdom has now begun. Mr Hanson's family have been kept fully up to date with developments. 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