Colombian prosecutors say they will seek murder charges against a former deputy director of the country's domestic intelligence agency in the 1994 assassination of leftist Sen. Manuel Cepeda.
Prosecutors issued a formal accusation on Tuesday against Jose Miguel Narvaez, a former Navy officer and prominent rightist.
He has been jailed for two years awaiting trial on charges of criminal conspiracy and illegal wiretapping in a domestic spying scandal.
The new accusation alleges Narvaez was the mastermind of the Cepeda assassination and cites testimony from jailed far-right warlords.
Prosecutors are also investigating allegations Narvaez was involved in the 1999 killing of humorist Jaime Garzon.
Narvaez denies the charges.