After 4 1/2 hours deliberating in private, the US "Charles Brown" murder court martial ended in London, May 9, without a verdict being announced. The decision will have to be approved by proper authority. Matthew Smith, 19-year-old US naval gunner pleaded not guilty to the murder of Gilbey, of Brick Lane, Bethnal Green. He was twice taken into the closed court whilst the findings were being considered. Rest of the time he spent reading papers and magazines and exchanging naval reminiscences with his guard. Associated press photo shows: Matthew, the accused, reading the paper whilst awaiting the verdict last night, May 9 his Navy guard look on