LOS ANGELES (CBS) — A gang member from the San Gabriel Valley has been sentenced to death for killing two people in Whittier.

KNX 1070’s Kim Marriner of the murders turned out to be a case of mistaken identity.

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Gabriel Ronquillo, 39, stabbed Gary Frausto to death when Frausto answered a knock on his door in 2004.

But Ronquillo killed the wrong guy: the Mexican Mafia had ordered a hit on Gary Frausto’s brother.

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His conviction on charges of murder with special circumstances included the 1999 murder or a rival gang mamber.

In court, the Judge rejected Ronquillo’s motion for a new trial, and sentenced him to the death penalty for his crimes.

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Ronquillo made no statement during sentencing.