The 33-year-old husband of Special Constable Nisha Patel-Nasri has been arrested over her murder.Mrs Patel-Nasri, 29, died after being stabbed in the leg in Sudbury Avenue, Wembley, northwest London, on May 11 last year. The couple had been celebrating their third wedding anniversary.Fadi Nasri, who runs a limousine business, was reportedly arrested at an address in north London earlier. It is believed he no longer lives in the home he shared with his wife.Scotland Yard said: "The 33-year-old man was arrested at an address in north London and is currently in custody at a west London police station."Another man, who is 37 and was arrested last year, is also being interviewed again today in connection with the case. Two men have already appeared in court over her murder.In the wake of his wife's stabbing, Mr Nasri issued a heartfelt appeal for help to catch her killer."Obviously, someone has got a guilty conscience - they shall be worrying about what they have done, or be shocked - or maybe it was an accident or mistake, or whatever," he said at the time."We know that someone has to know something who lives around them, a neighbour, or seen some blood, or someone acting suspiciously or nervous. It might not be important, but just give us a call and let us know."In December, Tony Emmanuel, 40, of Clements Road, East Ham, east London, was arrested and charged in the case while doorman Jason Jones, 35, from Hathaway Crescent, Manor Park, east London, has also been charged.Emmanuel and Jones are due to appear at the Old Bailey on March 16.More than 100 police officers formed a guard of honour at her funeral held at Golders Green Crematorium in north London.© Independent Television News Limited 2007. All rights reserved.