Tennyson Obih has admitted manslaughter, but denies murder
A jury has retired to consider its verdict in the trial of a man who stabbed a policeman to death.
Ikechukwu Tennyson Obih, 29, stabbed Bedfordshire Pc Jon Henry twice in the chest as he tried to arrest him in Luton town centre on 11 June 2007.
Mr Obih, 29, of Winsdon Road, Luton, denies murdering Pc Henry and denies the attempted murder of two window cleaners on the same morning.
He admits killing Pc Henry, 36, on the grounds of diminished responsibility.
The trial has heard that Pc Henry was called to George Street after Mr Obih stabbed window cleaner Stephen Chamberlain.
He stabbed the policeman as he tried to arrest him, and then stabbed another window cleaner, David Knight, leaving him injured.
The defence says that Mr Obih, who has been detained in the secure mental hospital in Rampton, Nottinghamshire, since his arrest, was suffering from paranoid schizophrenia at the time of the attack.
The court has heard he was diagnosed with the condition in 2005 after suffering problems from abusing alcohol and cannabis.
But the Crown says Mr Obih was not in an acute phase of the illness at the time he carried out the attacks.