Something that may be of use to you - when trying to look up more information on the four possible Texas Law Enforcement representatives you mentioned, I came across
this article, and later
this biography, about the longest-serving Ranger currently still serving (he's currently in Jasper, which isn't terribly far from Galveston, and checking the Wayback Machine indicates he was stationed there back in December of 2018 as well; note he's 68 at the time of the campaign, but still serving). In addition to apparently being a certified badass, he's also a Vietnam War veteran, a hypnotist, and was involved in some capacity in the investigation of the Galveston Killing Fields. His biography indicates he joined the Rangers in 1981 (conveniently, right around the time magic started seeping back into the world), has been involved in nearly every type of case - "murder, robbery, rape, kidnapping, and on and on" - and has been present at no fewer than 3 incidents where the suspect opted for suicide over arrest. That's in our world; in your world with a supernaturally-boosted murder and suicide rate, he's likely seen even more. "Ranger Joe" seems a strong contender for someone in law enforcement who has pierced the Facade, and some degree of connection to Kessler is certainly possible. While he's further away than the Rangers in Houston, I don't think it would be out of the question for him to be brought in for the Galveston investigation. He could certainly be another ally for the PC's (or a complication, if he isn't associated with Kessler).