DALLAS (AP) -- A federal judge in Texas has blocked an attempt by Los Angeles police to use a search warrant to obtain the decades-old taped conversations between Manson family disciple Charles "Tex" Watson and his now-deceased attorney.

U.S. District Judge Richard A. Schell's ruling earlier this month stopped authorities from executing a search warrant for the office of the bankruptcy trustee who has the tapes.

The warrant would have allowed the LAPD to circumvent a court order making the tapes off limits while Schell considers Watson's appeal of a bankruptcy court ruling.

Watson is serving a life sentence in California for his role in the 1969 murders of actress Sharon Tate and six others.

The LAPD believes Watson may have discussed other, unsolved murders with attorney Bill Boyd, who died in 2009.