Police investigating the disappearance and death of Nancy Cooper recently re-examined a cell phone and two address books belonging to the Cary mother, according to a new search warrant returned in the case.

Executed on Sept. 24 and returned Thursday, the search warrant does not shed any clues on what evidence investigators hoped to uncover. The search warrant indicates, however, that because of the divorce proceedings she had begun against her husband, Brad Cooper, Nancy Cooper kept the information on her Blackberry Pearl cell phone locked.

There have been no charges filed in connection with the killing of Nancy Cooper, who was last seen alive at her home July 12, when her husband said she went for a morning run. The friend with whom Brad Cooper said his wife was to run has said they did not go.

Two days later, Nancy Cooper's body was found lying face down in a drainage pond in an unfinished subdivision near her family's home. An autopsy later revealed that she had been strangled.

Days after her death, Cary police examined Brad Cooper's computers to determine whether he had researched how to dispose of a body, according to search warrants previously released.

In an affidavit filed Monday, a friend of Brad Cooper said that Cary police had pressured him to say that he helped Cooper try to establish an alibi after Nancy Cooper was found dead. Mike Hiller also said in his alibi that police told him they had to investigate Brad Cooper because, if they arrested someone else for Nancy Cooper's slaying without investigating him, a defense attorney would accuse police of doing "poor" police work.

Cary police declined to comment Thursday on Hiller's affidavit or its overall investigation.