Sergio Gomez, the lead singer of the group K-Paz de la Sierra, was kidnapped in Michoacan late Saturday. His strangled body was found Monday.
He'd received threatening calls warning him not to perform in Morelia.
On Friday, singer Zayda Pena was killed in her hospital bed after a botched earlier attempt on her life.
Grupera music is a form of folk music that blends norteno and tropical rhythms.
