Police say Mario Cardenas Guillen is a leader of the drug cartel . He was killed in a military operation Monday . He is wanted in connection with a number of drug trafficking cases , officials say . His father , Osiel Cardenas Guillen , was the cartel 's founder and former leader .
Authorities say Mario Cardenas Guillen is a leader of the Gulf cartel . He was captured in a military operation Monday . He is wanted in connection with a number of cocaine trafficking cases , officials say . His brother , Osiel Cardenas Guillen , was the cartel 's founder and former leader .