<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
I've heard that some murderers can slowly murder someone over time, with cumulative poisoning. Do you know of any cases of this?
<|assistant|>
I have heard of cases where poison was intentionally administered over a prolonged period of time in order to cause someone’s death. The most famous example is probably that of Maria Marten, who was murdered in 1827 by her lover, Captain John Marten. Maria's body was discovered 5 months after she had disappeared; the investigation of the time found no suspicious evidence in the house, however when her lover's excrement was examined, arsenic was found in the contents, confirming that it had been administered slowly over a long period. Another similar example was the case of Ruth Ellis in 1955, who was executed in the United Kingdom after being convicted of killing her abusive boyfriend, David Blakely. It was also confirmed that he had administered arsenic to her slowly over a period of time, resulting in her death.