Investigators still don’t know why family patriarch Matthew Stone Sr. gunned down his wife, their three children, two grandchildren and two women who had rushed to the home and were shot outside, Erie Police Chief Rick Lorah said at a news conference.

Lorah painted a picture of a family living in a home in isolated, filthy conditions. He said the authoritarian behavior of Stone, 45, started after his wife became pregnant with their first child more than two decades ago.

The adult victims of the Oct. 9 shooting previously were identified as Stone’s wife, Michelle Stone, 44; their daughter, Angelina Stone, 24, who was due to give birth Monday, three days after the shooting; sons Jonathan Stone, 19, and Matthew Stone Jr., 21; and two women who lived at other addresses: Lora Roberts, 37, and Twila Tanner, 51. Roberts was Michelle Stone’s sister.

A 5-year-old boy and a 22-month-old girl who were identified by relatives as Angelina Stone’s children also were killed. State law prevented authorities from releasing their names.

Family members told detectives that the elder Stone “restricted when family members could leave the residence or spend time with relatives,” Lorah said. In addition, Michelle Stone “stopped maintaining contact with friends.”

The elder Stone also kept a tight grip over the family’s money, including supplemental government income received for one of the grandchildren, Lorah said.

In 2019, Stone was arrested and charged with threatening his wife with the same .40-caliber handgun that he used in the Oct. 9 shootings. However, at a preliminary hearing, Michelle Stone “changed her original statement and those charges were withdrawn,” Lorah said.