Police said 78-year-old Edna Pierre-Jacques' granddaughter found her in the bedroom of her Troy Avenue home in the East Flatbush section at about 10 p.m.
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Detectives said she had head trauma and a ball-peen hammer was found near her body.
The medical examiner said manual strangulation is what cause her death, and it was ruled a homicide.
Pierre-Jacques' 76-year-old husband was in another room and was being interviewed by detectives. Her two children were also being interviewed.
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They have no history of domestic violence.
No arrests have been made in the case.