 He joined the 'commando Vizcaya' after the 2006 ceasefire and carried several attacks along with Arkaitz Goikoetxea, including the bombing of Civil Guard's cuartel in Durango on August 24, 2007, a bomb attack in front of a courthouse in Sestao on December 16, 2007, a car bomb explosion outside a Guardia Civil barracks in Calahorra, Rioja on March 21, 2008 and a van bomb placed in front of a Guardia Civil barracks at Legutiano, Álava, which killed one policeman, Juan Manuel Piñuel Villalón, and injured four.He is also believed to have carried a failed attack outside Getxo courthouse on November 11, 2007.According to police he's the main suspect of killing Spanish Socialist Workers' Party councillor Isaías Carrasco on March 7, 2008, as eyewitnesses described the killer as a 'tall man', a description which fits with Martitegi's two meters height.