 Devlin told the jury that, even if they decided that Mrs Morrell did not die a natural death but was killed, there had also to be the intention of killing.He pointed out in his account of the Morrell trial that prosecution could only draw inferences about the intention of an accused person, whereas the defence had the advantage that only the accused could say what had really been in his mind.The prosecution case, based on the police investigation and outlined in the opening speech of the Attorney-General Sir Reginald Manningham-Buller, was that Adams either administered or instructed others to administer drugs that killed Mrs Morrell with the intention of killing her, that these drugs were unnecessary as she was not suffering pain and had been semi-comatose for some time before her death.