Standing only 5'5" tall, being of slight build, and typically preferring victims of greater stature than his, Kearney was forced to resort to a system of subduing his victims that was unlikely to fail or create situations which could place him in physical danger or cause unwanted exposure to authorities. He was not known to resort to sadism or inflict pain on his victims as the other "Freeway Killers" did, preferring quickness and efficiency. While Kearney did later confess to having experimented with his victims' bodies out of curiosity, such as cutting open one of their stomachs, he did so post-mortem and did not inflict any physical suffering.