Story highlights Miguel Ángel Jiménez Blanco was found dead in a taxi he owned

He was a vocal leader of citizen self-defense groups and helped search for 43 missing students

(CNN) When he felt authorities weren't doing enough to protect his hometown, he organized more than 100 women to police the streets.

And when more families in his state came forward reporting that their loved ones had disappeared, he organized searches for them, too.

Saturday night, investigators in Mexico's Guerrero state say Miguel Ángel Jiménez Blanco was found dead inside a taxi he owned, with two gunshot wounds. Authorities haven't said whether there are any suspects in the slaying.

Jiménez was a vocal leader of citizen self-defense groups in Guerrero and a sharp critic of local officials, who he accused of hiding evidence tied to the students' disappearance.

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