Yeimy sobbed with her head in her hands as she described how her husband was tied to a pole, gagged and made to watch as she was raped by four fighters from the Revolutionary Armed Forces of Colombia (FARC) 12 years ago.
Her husband, Elkin, had been abducted by the FARC's 45th Front in the Tolima region of central Colombia after refusing to pay a revolutionary tax or hand their six-year-old son to the Marxist rebels to become part of the armed group, Yeimy said.
Reuters has not been able to verify Yeimy's account independently. FARC spokesman declined to comment on individual allegations of war crimes since the peace deal, saying these cases will be heard by the JEP.
But last month, three victims associations delivered 2,000 documented cases of sexual abuse to the JEP.
The tribunal's president, Patricia Linares, has said those responsible would not be allowed to escape justice, but would be eligible to receive non-jail sentences if they came clean about the crimes.
Colombia's National Centre for Historical Memory estimates 15,687 people were victims of sexual violence during the conflict, at the hands of right-wing paramilitary groups, security forces and the guerrillas.
Armed groups used sexual violence, including gang rape, to instill fear in communities, as a way of imposing their control over an area and as a form of punishment, rights groups have said.
The paramilitary groups, which continued to operate in many parts of Colombia despite a 2006 peace deal, were founded by landowners to protect themselves from rebels but quickly turned to drug trafficking and violence.
Lina’s home province of Sucre was involved in a scandal that erupted in 2006 over ties between paramilitary fighters and local politicians that resulted in the arrest of several congressmen.