Ex-Justice Minister Alberto Santofimio Botero allegedly orchestrated the death of Luis Carlos Galan at a rally in Bogota.
Santofimio Botero was reportedly a close associate of Colombia's one-time most notorious drug trafficker, Pablo Escobar.
Galan hailed from the former minister's Liberal Party and was leading the polls at the time of his death, running on an anti-corruption platform.
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