killings thathit headlines
Last year paranoid schizophrenic Ikechukwu Tennyson Obih was jailed for life for the murder of a police officer.
He stabbed Bedfordshire Pc Jon Henry twice in the chest as he tried to arrest him in Luton town centre on June 11 2007.
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Hide AdObih admitted killing him on the ground of diminished responsibility.
In 2008 paranoid schizophrenic Benjamin Frankum was found guilty of murdering a father of three who was stabbed more than 80 times in a random attack in front of his children.
He had been sectioned before but was living in supported accommodation when he killed. He was detained indeterminately under a hospital order.