MEXICO CITY — A missing Mexican priest was found shot dead off the side of a highway in western Mexico days after he was kidnapped from his parish residence, state prosecutors said Sunday. He was the third Roman Catholic priest to be slain in Mexico in the last week.The Michoacán state Attorney General's Office said in a statement that the Rev. José Alfredo López Guillen's body was found Saturday night in an area called Las Guayabas on the highway between Puruandiro and Zinaparo.López was kidnapped last Monday, the same day authorities in the Gulf coast state of Veracruz found the bodies of two priests who had been abducted from their parish residence the previous day. They also had been shot.Their deaths brought to at least 31 the number of priests killed in Mexico since 2006.The Michoacán prosecutor's office said an autopsy determined López had been killed about five days before his body was found.The Archdiocese of Morelia didn't announce López's abduction until Thursday, and Cardinal Alberto Suárez Inda, head of the archdiocese, pleaded for the priest's safe return in a video message. López's car was found wrecked Tuesday.On Sunday, the archdiocese reported López's death through its social media accounts and called on authorities to solve the crime."We lament these violent acts and the insecurity in our state," the statement said. "We hope that authorities solve this crime."The state prosecutor's office said its search for the priest began Wednesday after a relative reported López was missing.According to the office's statement, López was last seen Monday night when he ordered a delivery of four portions of food that arrived at 9:30 p.m. at the church in the town of Janamuato. Also Monday, López sent a message to a woman who cooked for him telling her that she would not be needed to work Tuesday, it said.The statement said that when López was not seen by his secretary Tuesday, it was thought he was visiting his family. But when he still did not show Wednesday, López's brothers were called to check. They found his quarters locked, but items were strewn on the floor and two vehicles were missing.No one received a ransom demand for López's return, the statement said.