AUSTIN, Texas (AP) – The Innocence Project says it’s discovered new documents that undermine the credibility of a key witness at the trial of a North Texas man whose execution for the arson deaths of his three children continues to be debated.

The New York-based nonprofit said Friday it had discovered a handwritten note that suggests prosecutor John H. Jackson may have given leniency to a jailhouse informant who said Cameron Todd Willingham confessed to killing his three children in 1991.

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The note included an Innocence Project court filing says suggests the witness, Johnny Webb, was charged with second-degree robbery instead of first-degree robbery.

The note is not signed or dated.

The Innocence Project wants Texas to give Willingham a posthumous pardon following his 2004 execution.

Jackson did not return a phone message.

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