I don't think they ever found a body (if they did, that information hasn't been shared yet) but this summer they pulled a fridge out of his old apartment and did an analysis on the sewer system after someone gave them a tip. A couple months later investigators said they were very confident she was killed in December 2019.

Based on this I am thinking they found her DNA in the fridge and/or septic system. It's grim but I think the way things were carried out, there might not be anything visible to find.