An investigation is underway after an 81-year-old woman’s body was found in two plastic bins inside her Illinois home.

According to WLS, officers performing a wellness check on June 10 discovered Thana Muhammad’s body in her basement. Sources told the network that the octogenarian had been “cut in half.” Meanwhile, police said she had sustained “severe trauma to her body.”

WGN-TV reported that Muhammad’s purse and 2012 Honda Accord were also stolen. Law enforcement ultimately located the vehicle Thursday in Chicago’s West Side.

Chicago Police Superintendent Eddie Johnson suggested that Muhammad might’ve known her killer.

“They put a lot of thought into what they did,” Johnson said, according to WLS. “The crime scene was very clean. They took their time and meticulously tried to hide what they had done.”

Despite Johnson’s comments, authorities haven’t announced a motive or cause of death.

The station reported that Muhammad, a retired radiologist, owned several properties in Chicago’s South and West Side. She reportedly moved into the Rosemoor neighborhood home—which she had rented out—two weeks before her murder.

Relatives said Muhammad was active in the community and that they didn’t know of anyone who wanted to hurt her. On Friday, they announced they are offering $5,000 for information leading to the 81-year-old’s killer.

“She did not deserve this, Chicago,” the victim’s daughter, Camille Durham, said.

“This is a monster. This is a monster.”

This is an ongoing investigation. Anyone with information about Thana Muhammad’s murder is urged to call Area South Detectives at 312-747-8271.

[Featured image: Thana Muhammad/WBBM video screenshot]