Miguel Ramirez assassinated in 1940's

Hello! ¡Hola! I am doing research to help a friend find his ancestors from Mexico. To start he knows his great-grandfather Miguel Ramirez was assassinated in Ayutla, Queretaro De Arteaga, Mexico, in the 1940's and was the Chief of Arms at that time in Ayutla. Also he knows he served in a war in Mexico prior to living in Ayutla, so we hoped there could be information in Jalisco, Zacatecas, and/or Aguascalientes regarding his service in the war. We would appreciate any advise or assistance in obtaining information about Miguel Ramirez.

Thank you!
Gracias!