"Before the trip I recorded a message for my children where I told them that in case something happened to me I wanted them to know their dad was doing what he believed in," he's reported to have said. Trevino Morales, 40, headed the notorious Zetas cartel until his capture by Mexican marines near the US border on Monday . Calderon led a high-profile campaign to capture cartel leaders but, by contrast, his successor Enrique Pena Nieto's community-focused approach to enforcement is more low-key and Z-40's arrest was much less trumpeted than previous successes.