A former CIA officer who was charged with repeatedly leaking classified information is set to plead guilty in federal court Tuesday to a single charge of disclosing the identity of an undercover CIA operative, according to people involved in the case.

The plea agreement would send the former officer, John C. Kiriakou, to prison for up to 30 months. It would mark the end of a case that involved the spilling of secrets to reporters and that was part of the Obama administration’s unprecedented crackdown on leaks.