Martin Suarez returned from a morning run in his Puerto Rican gated community in August 1994 to an assassin emerging from the shadows, a Smith & Wesson revolver heavy in his hand.

“Don’t run, motherf–ker,” the man shouted at him, as Suarez recalls in his new book, “ Inside the Cartel : How an Undercover FBI Agent Smuggled Cocaine, Laundered Cash, and Dismantled a Colombian Narco-Empire ” (Dey Street Books). “You aren’t going to outrun these bullets.”

Suarez, an FBI special agent with 23 years on the job, had faced Colombian narco-bosses, smugglers and killers, but this was different. The man pressing a gun into the back of his head was there to murder Suarez on his own doorstep, while his wife and two young sons were away.

He knew exactly who’d ordered the hit: El Toro Negro, th

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