exploring the world in comfort... once again. >>> the nemesis of detective ron goodwyn a man who calledo but would not give up his real name was behind bars after confessing to i.d. fraud. but even after seven years of investigating, goodwyn was just getting started. he believed castro was involved in much more serious crimes. heavy duty stuff. maybe even those mysterious deaths: the plane crash that killed mona, her boyfriend and her daughter lindsey; the death of brian hughes under a collapsed vehicle; that inexplicable head-on tragedy in which sara's and emily's mom jennifer died? and trish hughes's drowning. as the investigators called everyone with links to castro, the phone trail took goodwyn to south texas. >> it took us to south texas because patricia hughes the victim in the drowning was from beeville, texas. >> reporter: goodwyn questioned trish's family and a sister recalled trish had gone with a guy way back when. >> a guy by the name of daniel perez. >> reporter: had you ever heard that name in all your years of trying to figure out who lou castro was? >> no, i'd never hear