There, he began working as a drug dealer for La Línea, an enforcer unit for the Juárez Cartel, doing his business at a local bar called the Salón Sinaloa.
López eventually convinced himself that she was being unfaithful towards him, and in November 2006, he shot her to death with a .22 caliber pistol at his home in Colonia San Felipe.
The motivation for these murders is unclear, but it has been speculated that López believed they were romantic partners of his girlfriends or possibly due to drug-related conflicts.
On April 3, 2010, López broke into the Colonia Anapra home of 34-year-old Carmen Ivonne Caballero González, shooting down both her and her 6-year-old daughter, whose bodies he later dumped in the outskirts of town.
Despite loopholes in the state's justice system, which proclaimed that a suspect couldn't be prosecuted for a crime based only a confession,[3] López would eventually be found guilty and sentenced to life imprisonment.