Culhane, they added, also said she had interviewed a key witness in the case, Patricia Felix.
They said that in her own sworn declarations, Culhane said she had met with Felix several times in January at Felix's home in Stockton, Calif. Felix has not lived at the address Culhane cited since July 2005, prosecutors said.
Similarly, the five jurors in question told prosecutors under oath this week that "they have never been contacted by anyone from the Morales team, that they have no idea who Kathleen Culhane is, that they did not sign declarations the Morales team attributed to them, and most importantly, they do not support clemency," prosecutors said in arguments presented to Schwarzenegger.
One juror's name was misspelled on one of the documents described as fabricated.
"I never would have signed a declaration under penalty of perjury that included a misspelling of my name without at least correcting the misspelling," said the juror, whose name was redacted from the new declaration.
A sixth juror also submitted a sworn declaration, but it was not forged. In it, the juror left the decision on Morales' fate up to the governor.
A spokeswoman for Schwarzenegger said he would review all clemency-related information submitted to him by attorneys on both sides of the case.
In the meantime, on a separate legal front in the Morales case, a federal judge in San Jose is expected to rule by Tuesday on whether to block the execution long enough to determine whether lethal injection is unconstitutionally cruel and unusual punishment.
Morales' team argues that a paralyzing agent in the lethal injection procedure masks whether the inmate is in extreme pain before death.
U.S. District Judge Jeremy Fogel's ruling has the potential to block all executions in California until the matter is resolved.
