"Our embassy in Pakistan confirmed on Thursday that they have received evidence that Daniel Pearl is dead," spokesman Richard Boucher said in a statement in Washington.
"We have informed Mr Pearl's family and expressed our sincere condolences," he said adding, "The murder of Mr Pearl is an outrage and we condemn it."
The spokesman said that the US and Pakistan would identify the culprits and bring them to justice.
Meanwhile, the WSJ also announced that it has given up hopes of finding Pearl alive.
"We now believe, based on reports from the US state department and Pakistan, that Danny Pearl was killed by his captors," WSJ publisher Peter Kann said statement released to the media.
"We are heartbroken at his death," he said.
The Mumbai-based reporter was abducted on January 23 from the Pakistani port city of Karachi while he was pursuing a story on Islamic militants.
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