KKR & Co., the private-equity firm run by billionaires Henry Kravis and George Roberts, agreed to buy U.S. clinical-research company PRA International from Genstar Capital LLC.

The deal is expected to close in the third quarter, North Carolina-based PRA said in an e-mailed statement today. The purchase price was $1.3 billion, according to a person briefed on the matter who asked not to be identified because the terms haven’t been disclosed publicly.

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