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Tragic Murder-Suicide Claims Four Lives in Washington

1/1/2026

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Summary

Story summary

Police suspect a murder-suicide after four people were found dead in Mercer Island and Issaquah, Washington, including Danielle Cuvillier, 80, and her son Mackenzie P. Williams, 45.
A welfare check led to the discovery of Nick Williams and a woman in her mid-40s at a nearby residence.
Police report no ongoing threat and are examining connections among the victims.
The motive remains unclear.

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Story summary

Police suspect a murder-suicide after four people were found dead in Mercer Island and Issaquah, Washington, including Danielle Cuvillier, 80, and her son Mackenzie P. Williams, 45.
A welfare check led to the discovery of Nick Williams and a woman in her mid-40s at a nearby residence.
Police report no ongoing threat and are examining connections among the victims.
The motive remains unclear.