The widow of a man killed by a masked Islamic State militant known as "Jihadi John" says she wants him caught alive. Dragana Haines said the "last thing" she wanted for the man who had killed her husband, British aid worker David Haines, was an "honourable death". The militant, pictured in the videos of the beheadings of Western hostages, has been named as Mohammed Emwazi, a Kuwaiti-born Briton from west London. Mr Haines' daughter said she wanted to see "a bullet between his eyes". Emwazi, who is in his mid-20s and was previously known to British security services, first appeared in a video last August, when he apparently killed the US journalist James Foley. He was later thought to have been pictured in the videos of the beheadings of Mr Haines, US journalist Steven Sotloff, British taxi driver Alan Henning, and American aid worker Abdul-Rahman Kassig, also known as Peter. Mrs Haines told the BBC she wanted him to be caught alive and not have an "honourable death" by being killed in action. She added: "I think he needs to be put to justice, but not in that way." However Mr Haines' daughter, Bethany, told ITV News: "I think all the families will feel closure and relief once there's a bullet between his eyes." There have been questions about how Emwazi was able to travel to Syria and how he may have been radicalised. Emwazi graduated from the University of Westminster in 2009 and it has been suggested he may have come into contact with extremists while he was a student there. Student Rights, a group tackling extremism on university campuses, told BBC News it had found a number of events at the university that featured extremist Islamist preachers, and large amounts of extremist material had been shared with students. Rupert Sutton, the group's director, said: "Given that he travelled so soon after graduating, it's entirely possible he picked up the views that led him to travel whilst he was studying." A spokesman from the University of Westminster said it "condemned the promotion of radicalisation, terrorism and violence or threats against any member of our community". It said the Education Act placed two competing responsibilities on universities to promote free speech and a duty to protect students from harm, but it was working with the government's Prevent strategy to tackle extremism. BBC security correspondent Frank Gardner told Radio 4's Today programme there were questions for the security services about how "someone on a terror watch list, somebody of real concern, was able to slip out of this country and turn up in Syria like that unhindered". While Chris Phillips, former head of the National Counter Terrorism Security Office, said the case demonstrated the need for security services to have increased powers, including access to phone records, proposed in the so-called "snoopers' charter". He said: "It's clear also that TPIMs (Terrorism Prevention and Investigation Measures) and control orders just don't work. We need to have a way of dealing with people in this kind of situation. "The numbers are growing and the police resources are not.