Police say a person remains in custody Thursday following the fatal stabbing of an 85-year-old woman inside her Bed-Stuy apartment earlier this week, but no charges have been filed. The woman was identified as Julia Boomer, who lived inside an apartment building on Throop Avenue. Police say officers were called to the building just before 10 p.m. Tuesday after a 911 call reported that a woman had been stabbed. When officers went inside the apartment, they found Boomer lying on her back in the living room with multiple stab and slash wounds, including injuries to her face. She was rushed to NYC Health + Hospitals/Kings County, where police say she was pronounced dead at 10:41 p.m. The case is being investigated as a homicide. Police have not identified the person in custody, but sources say it is Boomer’s 22-year-old grandson. Investigators also have not confirmed whether the knife used in the stabbing was recovered. The 911 call log shows a series of urgent calls starting around 9:57 p.m. Dispatch notes indicate a woman could be heard screaming, and someone was heard saying, “Mommy, come with me.” Police have not said who made the calls or whether anyone else was inside the apartment at the time. Neighbors say the loss has shaken the block. One longtime resident described Boomer as kind and friendly, someone who would often greet people as she passed by.