Final answer:
In 'Dr. Jekyll and Mr. Hyde,' the murder of Sir Danvers Carew was witnessed by a maid, whose testimony is crucial to the story.
Step-by-step explanation:
The murder of Sir Danvers Carew in the story 'Dr. Jekyll and Mr. Hyde' was witnessed by a maid. This event is a pivotal moment in the story, revealing the violent and uncontrollable nature of Mr. Hyde. The maid's account of the murder serves as a critical piece of evidence that propels the unfolding of the plot, as investigators try to understand the connection between the respectable Dr. Jekyll and the despicable Mr. Hyde.