It is just my feeling that in this case and in the Keddie Murders also the killer himself likely reported his own crime. Here is a link with some information about the case and a picture of Dorothy with her son I had not seen before which of course as in all of these cases brings home the wickedness of the crime:
https://tallypress.com/fun/5-shocking-and-gruesome-unsolved-murders/
3) Tainted Love
In 1980, a man stalked and expressed love for Dorothy Scott, a 32-year-old single mother. She did not return his feelings. Unrequited love swiftly turned into hate, and the man threatened to cut Dorothy into pieces so that no one can ever find her. One day, Dorothy disappeared. 4 years later, a construction worker found some skeletal remains, confirmed to be Dorothy’s. During the 4 years, the same man contacted Dorothy’s mother repeatedly and informed her that he had Dorothy. The man also contacted the radio station, confessing to the murder of Dorothy and revealing her last moments after that. The family still received a couple of phone calls asking “Is Dorothy home?” after her confirmed death. The calls eventually stopped, but the killer still remains at large.