Overview
- Mercer Island police identified Danielle Cuvillier, 80, and her son Mackenzie P. Williams, 45, found with gunshot wounds during a welfare check prompted by a concerning email from her attorney.
- Detectives say the Mercer Island scene appears to be a homicide followed by a suicide, with Williams believed to be the shooter based on preliminary findings.
- After Mercer Island officers flagged a second address, Issaquah police found a man in his mid-30s and a woman in her mid-40s dead inside a home with no signs of forced entry, and investigators say the deaths are related.
- The family’s attorney identified the Issaquah male victim as Dominick (“Nick”) Cuvillier, the younger son who had Angelman syndrome, while reports indicate the woman was the daughter-in-law.
- Investigators recovered four firearms inside the Mercer Island home and a fifth in a vehicle, forensic analysis is underway, and the King County Medical Examiner will determine cause and manner of death for all four.