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.
Browne stated that most of his killings were never pre-planned and were against victims of opportunity he met in motels, convenience stores and similar settings, and he would kill them using a variety of methods ranging from strangulation, shooting, pushing them off high places such as cliffs, stabbing them with items such as screwdrivers and ice picks, and even using ether and other compounds to incapacitate them.