Scott, who was also the biological mother of the rapper's adopted daughter Alaina Scott, was found unconscious in a home in Macomb County, Michigan, along with an emaciated elderly woman who was taken to the hospital.
"She was found slumped over in bed and unresponsive," Mayor James Fouts of Warren, Michigan told PEOPLE. "It's suspected to be drug use, possibly heroin."
The Macomb County Medical Examiner's office confirmed Scott's identity, but could not confirm an official cause of death as a toxicology report is still pending.
Scott's sister Kimberly Mathers, posted a heartfelt message saying: "Dawn was my sweet, beautiful sister who lost her way. I kept a light lit for her hoping she'd find her way back to me. I miss her and love her more than anything I could ever say. I wish she was here so I could hug her and tell her I love her."
She added on the funeral home's tribute wall: "Half of me is gone and I will never feel whole again. She made me laugh and kept me on my toes. She was the best sister and friend in the world and I will miss her until we are together again."
all i want in life is for the people i care about to be truly happy and healthy— Alaina Scott (@alaina__scott) December 17, 2015
Although she didn't mention any names, in December, Alaina tweeted a message, wishing for the wellbeing of those she cares for most.
"All I want in life is for the people I care about to be truly happy and healthy," the 20-year-old wrote.
In her obituary, Scott is remember as the "loving mother of Alaina, Adam, and Patrick; Cherished sister of Kimberly Mathers; Beloved daughter of Casimer and Kathleen Sluck; Dear Aunt of Whitney Scott, Hailie Scott, and Parker Scott' Dawn is survived by many extended loved ones and friends."
Her memorial service is set for Saturday at 10 a.m. at a funeral home in Michigan.
Eminem's rep did not respond to PEOPLE's request for comment.