A few years into his sentence, he sent letters to the El Paso County Sheriff's Office in which he claimed to be a serial killer who has killed approximately 48 or 49 people since 1970 across several states.
[3] In his letters and conversations with investigators, Browne would repeatedly claim that he murdered approximately 48 or 49 people, the majority of whom were women whom he considered to be of "low moral value" who cheated on their boyfriends and husbands.
According to this map, he has killed 17 people in his native Louisiana; 9 in Colorado; 7 in Texas; 5 in Arkansas; 3 in Mississippi; two each in California, New Mexico and Oklahoma; and a single victim in Washington State.
[6] In contrast to his claims, Browne has provided few details for a majority of his purported kills, leading most investigators to believe that they are likely a fabrication made either for attention or to spite the sheriff's office which first convicted him.
[18] Over the years, Browne started writing numerous cryptic letters to the El Paso County Sheriff's Office, one of which stated that "the score is you 1, the other team 48.
Whilst initially skeptical of his claims, interest in his confessions was bolstered after Browne accepted a plea deal relating to the 1987 murder of Rocio Sperry, for which he was given another life term.
While several seasoned investigators and writers specializing in studying serial killers, among them Robert Ressler and James Alan Fox, have stated that he is likely responsible for more murders than those for which he was convicted, they also believe Browne is exaggerating the number of victims.