Nelson's victims were mostly landladies, whom he would approach on the pretext of renting a room. Many of these victims were targeted after having placed "room for rent" advertisements in local newspapers. Nelson, well-versed in Christian theology, often studied his worn Bible, using it to keep his victim at ease and off-guard. Once he had gained their trust and was able to access their homes, he would kill them (almost always by strangling) and sometimes engage in necrophilia with the corpse. Nelson would often hide the body, leaving it under the nearest bed. In several of his murders committed in Portland, he went to additional lengths to conceal the body, hiding it in the attic or in a steamer trunk within the house. Other victims were concealed in closets or behind furnaces in the house.