West Valley City police say they took a fingerprint from a man using the name Marcelo Marquez during a misdemeanor hit and run arrest in 2003.
However, Utah authorities say fingerprints from such suspects are not regularly entered into a database that would flag other arrests in the U.S. or deportations.
Marquez flew under the radar until he and his wife were arrested Friday after the California shootings.
Authorities say the fingerprints have been matched to biometric records showing his real name is Luis Enrique Monroy-Bracamonte, and he had been convicted in Arizona for selling drugs in 1997 and deported to Mexico twice.
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