Are two murders from 1975 Austin related or not?

The rise in faceless crimes in the 1970s had APD hoping to tie crimes together like the murders of Phyllis Butto and Martha Read.

In the 1970s, Austin, Texas, doubled in size, cementing its status as a big city. With that came anonymity, new people, and faceless crimes. Like many big cities before them, Austin offered villains ease; they could move through the city, leaving no witnesses, no face.