Miguel Paredes, 32, was convicted yesterday evening along with two other men in the September 2000 slayings of three people with ties to the Mexican Mafia.
The victims' bodies were rolled up in a carpet, driven about 80 kilometers southwest, dumped and set on fire. A farmer investigating a grass fire found the remains.
Parades was pronounced dead at 6:54 pm (local time). The execution was carried out after the US Supreme Court turned down a last-day appeal from attorneys who contended Paredes was mentally impaired and his previous lawyers were deficient for not investigating his mental history.
Paredes' attorney, David Dow, said the execution should have been stopped because Paredes had "a significant mental disease" that may have affected his judgment when he told his previous lawyer 10 years ago not to investigate his family background.
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In a response filed Tuesday morning, state lawyers said Paredes "presented no evidence that he is or ever has been mentally ill or incompetent," and that his earlier attorney couldn't be considered deficient when he "abided by Paredes' explicit instructions." Lower courts sided with the state, which also noted that the latest appeal was filed after a deadline.
They told jurors at his capital murder trial in 2001 that Paredes was suspected in several other crimes, including other killings and drive-by shootings. Defense attorneys argued that he grew up in a gang-infested neighborhood, and the only way to survive was to join a gang.
Paredes was convicted of fatally shooting Nelly Bravo and Shawn Michael Cain, both 23, and Adrian Torres, 27.
Prosecutors said the three were shot when they tried to collect drug money at the home of John Anthony Saenz, a leader in Paredes' gang.