Ulises Valladares, 47, was shot to death by an FBI agent when law enforcement stormed a house in northeast Houston on Jan. 25.
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Valladares was bound, gagged and taken from his Conroe home the day before. His young son was also bound and gagged, but he was left at the house.
Because it was a kidnapping, FBI agents were involved in the raid at the Houston residence.
TIMELINE: Far-reaching kidnapping ends in victim's killing
But Houston Police Chief Art Acevedo said his department's investigation found no forensic evidence or witness accounts that corroborate the agent's claim of what happened that day.
The agent said he shot Valladares when Valladares grabbed the agent's gun after the agent broke a window to get inside.
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"Our investigation has determined that the sequence of events as it relates to how that shooting occurred is not supported by the totality of the evidence and the statements in this investigation," Acevedo said.
He didn't go into details because the investigation has now been turned over to the Department of Justice, the Office of the Inspector General in San Antonio and the FBI.
The three kidnapping suspects were all taken into custody at the scene.
RELATED: Kidnap victim's brother says he's still waiting to hear from FBI after botched raid
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