Top security officials revealed details of the operation that led to the death of Mexico’s most wanted drug cartel leader.

Drug cartel leader Nemesio Rubén Oseguera Cervantes, commonly known as "El Mencho," was killed in a military operation on Feb. 22.

Former drug kingpin Owen Hanson joined NewsNation to discuss the signficance of the Jalisco New Generation Cartel leader's death.

Officials identified “El Tuli” as a top CJNG logistics and financial operator who acted as a right-hand man to "El Mencho."

A clandestine romantic meeting wasn't as secret as fentanyl kingpin "El Mencho" believed, leading to a fierce gunfight and the end of a narco-era.

Why it matters: President Trump has for months pressed Mexican officials to target drug cartels and the U.S. had offered a reward of up to $15 million for information leading to the arrest of Oseguera Cervantes, known as "El Mencho," who led the Jalisco New Generation Cartel (CJNG) — a designated terrorist organization in the United States.

Oseguera, 59, the mastermind of the ‌powerful Jalisco New Generation Cartel (CJNG) died in custody after being injured in a military operation by Mexican special forces in the town of Tapalpa in Mexico's Jalisco state, according to Mexico's defense ⁠ministry.

Mexican officials said that about 80% of the recovered weapons in crime scenes were purchased in the United States and smuggled across the border.

“El Mencho” has long been pursued by U.S. and Mexican authorities for fentanyl and methamphetamine trafficking.

(Corrects Oseguera's age to 59, not 60, in second paragraph) By Drazen Jorgic MEXICO CITY, Feb 22 (Reuters) - Mexican drug lord Nemesio Oseguera, commonly known as 'El Mencho,' infamous for the bloody trail of bodies he left behind in battles with government forces and rival gangs,