Mendez was arrested Monday night in a federal police operation . He is under investigation for attempted murder and crimes against health , officials say . Flavio Mendez Santiago was on a list of Mexico City 's one most-wanted fugitives .
Flavio Mendez Santiago was arrested Monday night in a federal police operation . He is under investigation for attempted murder and crimes against health , officials say . Mendez was on a list of Mexico 's 37 most-wanted fugitives .