After his term in the state legislature, Murrieta won a seat as a deputy in the LXIII Legislature of the Mexican Congress for Sonora's 6th district in 2015. It was a landslide, as he took 49.34% of the popular vote, nearly twice as much as his PAN rival Nidia Eloísa Rascón Ruiz who finished with 25.69%. During his three-year term he was a member of seven committees, including the public safety committee and the justice committee. In 2017 Murrieta announced his intention to run for municipal president of Cajeme in the following year's elections under the PRI banner. In February 2018, however, he resigned from the party and joined PAN after disagreements arose regarding the internal election of Emeterio Ochoa Bazúa as party candidate. Murrieta continued his career in law after leaving office. He, along with former Baja California Attorney General Antonio Martínez Luna, represented the LeBarón family in their legal case dealing with the fallout of the LeBarón and Langford families massacre in northeastern Sonora that left nine people dead in November 2019. Death Murrieta was shot and killed in Ciudad Obregón on 13 May 2021. He was standing on a street corner distributing flyers for his campaign for the municipal presidency (now under the Citizens' Movement banner) when a car approached and fired multiple shots, hitting him in the head. A female campaign worker was also injured. Murrieta was rushed to a local hospital, where he died of his injuries. In his final campaign video, which was released a few days later, he had denounced crime and impunity in the city while stating that he was not afraid. Governor Claudia Pavlovich Arellano condemned the killing and vowed to work with the state attorney general's office to find the perpetrators. 15 candidates from Murrieta's party in Sonora requested some type of protection following the attack. On 9 August 2021, Omar Alejandro Sayula Torres, a.k.a. El Mou, was detained in Ciudad Obregón and was identified as a possible suspect in the killing of Murrieta. The attack was attributed to the Caborca Cartel, the same group which had carried out the massacre on Murrieta's clients, the LeBarón family, in 2019. The Caborca Cartel had been in a bloody conflict with the Sinaloa Cartel for control of the region, leading to an increase in murders over the past several years. Murrieta was due to travel to Tijuana on the day after he