Kolo was a Xindi-Reptilian commander. He was the captain of an attack squadron that defended the Xindi superweapon from attack on February 13, 2154. (ENT: "Countdown")
Background Information
Though some websites indicated that Andrew Borba's "Reptillian Lieutenant" character is Kolo, this is unlikely as that character commanded the weapon and was ranked lieutenant, while Kolo was in command of an attack squadron protecting the weapon. Kolo is most definitely deceased now, but how is uncertain. He may have been killed when his own ship was destroyed, when Dolim's ship was destroyed, or when the humans boarded the weapon.