The body, which was wrapped in blankets, was so badly beaten that police have been forced to use her fingerprints to identify her, WJBK-TV reports. Police have not released her name, but said she was an African American woman in her mid-40s.
"There was a lot of trauma to the body, so it's pretty apparent that she's a victim of a violent homicide," Dearborn Detective James Serwatowski said.
Police say they were able to make the four arrests after a man turned himself in, saying he helped dispose of the body. The man told police the names of three other people involved, and even said where the woman was murdered.
WJBK-TV reports that police obtained a search warrant for the location the man provided and found evidence of an assault.
The names of the four people in custody have not yet been released. TheBlaze's call to the Westland Police Department's special investigations unit was not immediately answered.
More on the horrific story via WDIV4-TV: