I don’t know anything about that... but all in one area? Sounds more like the cartels and drug runners than a serial killer.
http://maps.google.com/maps?q=county+road+2048+liberty+county+texas&oe=utf-8&client=firefox-a&ie=UTF8&hq=&hnear=County+Road+2048,+Daisetta,+Liberty,+Texas+77564&gl=us&ll=30.169395,-94.670627&spn=0.009665,0.017574&z=16
Pretty rural area at County Road 2048 and 2049