One of the main witnesses in a court case investigating politicians' links to right-wing paramilitaries in Colombia has been killed.
Luis Eduardo Gomez, 70, was shot dead by gunmen in his home in Arboletes, in north-western Antioquia province.
He is the second witness in the case to be killed this week, officials say.
Prosecutors are investigating scores of local politicians over their alleged links to the paramilitary United Self-Defence Forces.
The United Self-Defence Forces, or AUC, was formed by landowners and drug traffickers in the 1990s to combat Colombia's left-wing guerrillas.