PETALUMA (CBS/AP) – A second defendant has pleaded guilty in a case alleging that a Northern California slaughterhouse at the center of a massive recall processed and distributed tainted beef.

Eugene Corda, an employee of Petaluma-based Rancho Feeding Corp., entered the plea to one count of aiding and abetting in the distribution of adulterated, misbranded and uninspected meat earlier this month.

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A co-owner of the slaughterhouse, Robert Singleton, also pleaded guilty to the same charge in August. The two other defendants, co-owner Jesse Amaral Jr. and Felix Cabrera, are still facing charges. They have pleaded not guilty.

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Federal prosecutors say the owners schemed with employees to slaughter about 79 cows with skin cancer of the eye.

The plant’s operations were halted in February after a series of beef recalls.

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