The Alvin remains were ID'd as Georgia Geer and Brooks Bracewell. I was never able to find anything on the 3rd, allegedly male victim until now. This article is in newspaperarchive.com and I don't have a subscription there so I can't make it bigger but if you hover over the front page and "click to view", it's readable. Or scroll down to the transcribed text.
Alvin Sun Newspaper Archives, Apr 7, 1981
Alvin Sun Newspaper Archives, Apr 7, 1981