American smuggler of drugs and arms, airplane pilot, and money launderer
Adler Berriman "Barry" Seal was a commercial airline pilot who became a major drug smuggler for the Medellín Cartel. When Seal was convicted of smuggling charges, he became an informant for the Drug Enforcement Administration and testified in several major drug trials. He was murdered in 1986 by contract killers hired by the cartel.
Barry Seal on wikipedia