The widow of a lecturer stabbed to death has asked why his psychotic killer was on the streets. Dr Jeroen Ensink was killed by Femi Nandap last December, Nadja Ensink-Teich now wants to know why previous knife charges against Nandap were dropped. Report by Laurencev. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn