In chapter 6, the remaining guests all discuss their ideas about what is happening on the island, and in particular how Mrs. Rogers died. Recall how the night before Mrs. Rogers's death, she and her husband were accused of murdering her elderly former employer. This makes Emily Brent suggest that Mrs. Rogers “died of fear.” Emily thinks that Mrs. Roger could not handle others finding out about her role in the murder and died of a guilty conscience.
But William Blore, a former policeman, suggests that Mr. Rogers killed her. His job as a policeman likely made him assume that someone on the island did it. Notice how he laughs when Macarthur says that he doesn’t think it’s possible for a man to kill his wife. Blore has probably seen much worse than that in his career and thus does not think his suspicion is illogical.
Blore thinks it is suspicious that Rogers said his wife had nothing to eat or drink before bed. He also explains that Mr. Rogers had a motive because he was afraid of what his wife might say about their involvement in murder. “She’s a living danger to her husband,” Blore says, suggesting that Mr. Rogers felt that he had to kill his wife to protect their secret. He also points out that the fact that Mr. Rogers has been accused of murder in the past makes his suspicion even more realistic.