Hebert Veloza, 50, alias "HH," touched down in Bogota yesterday after being loaded on a plane in Alexandria, in the US state of Virginia, Colombia's migration service said in a statement.
He faces charges in his homeland of murder, forced recruitment of minors and criminal association.
He had been in prison in the United States since 2009 for drug trafficking, after Colombia allowed his extradition.
Veloza had quit as a paramilitary leader in 2004, but then clandestinely returned to the activity in 2006.
His extradition to the US was criticised by rights groups and victims' associations, which feared his crimes in Colombia would go unpunished.
Colombia was rocked for more than half a century by an armed conflict that over that time involved around 30 left- wing guerrilla groups, extreme-right paramilitary outfits, and government forces. More than 260,000 people were killed, more than 60,000 disappeared, and seven million people were displaced within the country.
Negotiations have been under way since February to strike a similar pact with the smaller ELN guerrilla group, the last insurgent organisation which is observing a ceasefire valid to early January 2018.
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