What did the banker do to kill the lawyer?

The banker tapped on the window with his finger, but the prisoner made no movement in the cell. Then the banker cautiously tore the seals from the door and put the key into the lock. The rusty lock gave a hoarse groan and the door creaked. The banker expected instantly to hear a cry of surprise and. the sound of steps. Three minutes passed and it was as quiet inside as it had been before. He made up his mind to enter. He thought the prisoner (the lawyer in confinement) as a devil who was asleep, dreaming the millions. He decided to throw the half-dead thing on the bed, smother him with a pillow and he will be dead. But before this planing, he went on to read what the lawyer had written as a note kept on the table and was fast asleep. Understanding the whole thing the conscience of the banker did not allow to do any misbehavior and he came back to his room.