This character gives Utterson the murder weapon of Danvers Carew, but claims he cut off contact with the culprit, and his suicide note explains that he began taking a transformative potion, but that he soon lost control of the process.
One man suspects that this character is being blackmailed after he makes changes to his will. His friend Dr. Lanyon cuts off contact with him when they disagree over this man's scientific research, and later dies from shock when learning the truth. This character gives Utterson the murder weapon of Danvers Carew, but claims he cut off contact with the culprit, and his suicide note explains that he began taking a transformative potion, but that he soon lost control of the process. For 10 points, name this scientist who unleashed his evil alter ego, Mr. Hyde, a creation of Robert Louis Stevenson.
One man suspects that this character is being blackmailed after he makes changes to his will.
Dr. {Jekyll} [prompt on Mr. {Hyde} until mentioned]