The 1973 misidentification of Michael Baulch was discovered as a result of an independent investigation conducted by freelance writers Barbara Gibson and Debera Phinney, who contacted Dr. Derrick with a tip indicating that the second victim unearthed from the boat shed had been misidentified; upon conducting additional DNA testing, Dr. Derrick discovered their suspicions were correct. Henley had stated in his confession to police that he and Corll had "choked" Michael Baulch and buried him at Lake Sam Rayburn. The unidentified victim mistakenly identified as Baulch had been killed by two gunshots to the head and buried inside the boat shed. Three factors helped lead to the 1973 misidentification of Baulch: Michael's parents had previously filed a missing persons report on their son (who had previously left home to search for his older brother) in August 1972—precisely the same time as the second victim unearthed from the boat shed was estimated to have been killed. This was the only missing persons report on file for Michael Baulch. In addition, the victim was of a similar height to Baulch and circumstantial dental fractures had also helped facilitate the misidentification. On November 4, 2011, the victim mistakenly identified as Baulch (case file ML73-3333) was identified through DNA analysis as Roy Eugene Bunton, a Heights teenager who was last seen by his family heading for work at a Houston shoe store on or about August 21, 1972. Bunton's family had always believed him to be a victim of Corll and had contacted Dr. Derrick in 2009 to submit a DNA sample for comparison with the unidentified bodies. Initially, the results conducted had been negative due to the misidentification of Bunton's remains as being those of Baulch. However, upon discovering the 1973 misidentification of Baulch's remains, DNA samples obtained from Bunton's family were compared to those taken from the body mistakenly identified as being that of Baulch and these proved to be a conclusive match to Bunton. In the confession given by Henley on August 9, 1973, the youth had stated that victim Mark Scott had been strangled and buried at High Island. Brooks had also stated in his confession that Scott was likely buried at High Island. Scott had been a blond youth who had not had any teeth extracted prior to his disappearance; however, a Dr. Elizabeth Johnson of the Harris County Medical Institute had concluded in 1993 that the fifteenth set