Henry Lee Lucas (August 23, 1936 - March 13, 2001) was an American criminal, convicted of murder and once listed as America's most prolific serial killer. However, he later recanted his confessions. He once flatly stated "I am not a serial killer" in a letter to researcher Brad Shellady. Lucas confessed to involvement in about 3,000 murders, an average of about one murder per day between his release from prison in mid-1975 to his arrest in mid-1983. A more widely circulated total of about 350 murders committed by Lucas is based on confessions deemed "believable" by a Texas-based "Lucas Task Force," a group which was criticized by Texas Attorney General Jim Mattox for sloppy police work and taking part in an extended "hoax".