Mexican prosecutors said Saturday they were looking for relatives of slain Zetas cartel leader Heriberto Lazcano, whose body was stolen, hoping to obtain DNA samples for a positive ID. Mexico\'s navy said it had killed Lazcano -- the leader of the feared Zetas cartel, which has been implicated in a string of mass killings in recent years -- in a shootout at a baseball game last weekend in the small border town of Progreso. Officials later revealed that they had not been aware the corpse in their possession was Lazcano\'s until after a gang of heavily-armed, masked men stormed into the funeral parlor and took his body and that of another gunman killed in the same confrontation. But authorities say they have fingerprint and photographic evidence showing the body was \"El Lazca,\" and they are now looking to seal the deal using a DNA sample they took before the cadavers were stolen. \"We are searching for a genetic match to confirm the identity,\" Jose Salinas Cuitlahuac, the attorney for specialized investigation of organized crime, told Formato 21 radio. The official said it was difficult to locate Lazcano\'s relatives, who are in hiding, and then to get them to voluntarily agree to being tested. President Felipe Calderon has hailed the killing of \"one of the biggest and most dangerous\" druglords in Mexico. The Zetas are one of Mexico\'s most powerful drug gangs, major players in the country\'s vicious drug war, which officials say has claimed 60,000 lives since the launch of a military crackdown in 2006. Lazcano had a $2.6 million bounty on his head in Mexico and another reward offered by the United States for $5 million.