Murder suspect David Norris has told the Old Bailey he cannot remember where he was when Stephen Lawrence died but he was not involved in the killing.Giving evidence for the first time, Mr Norris said: \"I am an innocent man.\"He also told the court he was \"ashamed\" of secretly recorded comments he made in 1994, heard by the jury, in which he said he would torture black people.Mr Norris, 35, and Gary Dobson, 36, deny murdering Mr Lawrence, 18, in Eltham, south-east London, in 1993.