A HUDDERSFIELD man of 38 was a key witness to an alleged murder. He watched as a friend, a mother-of-three from Bradford, was stabbed and bundled into a car. Police launched a murder inquiry after Rachel Kemp, 39, was attacked in Widnes, Cheshire. After the Huddersfield man and other friends of Mrs Kemp told the police of the attack dozens of officers joined a chase spanning two counties. It finished in Liverpool, when the suspect's car - containing Mrs Kemp's body - crashed.