Meet Rosalio Reta, an inmate in Texas who killed over 30 people during his time as a hitman—starting at age 13—for Miguel Treviño, the just-captured boss of the brutal Zeta drug cartel.

In a Center for Investigative Reporting interview with Reta, conducted before Treviño was arrested, Reta tells his story: "It's eating me inside little by little, and there's nothing I can do or say to justify my actions."

[via Mother Jones]