Police commander Colonel Orlando Tobo says 40-year-old Sergio Tovar died in a parking lot in the department of Cesar after a gunman fired six shots from a 9mm pistol and fled on a motorcycle.
Tobo says Tovar died Thursday.
Tovar was extradited to the U.S. in 2008 with 13 other paramilitary chiefs on drug-trafficking charges.
His Colombian lawyer said he was trying to reach Tovar with the news, adding that Sergio Tovar was a rancher with no legal trouble.
Since the extradition, other relatives of the former paramilitary chiefs have been assassinated as well. (AP)