Dylann Roof wants his attorneys back until the penalty phase of his trial (copy) (copy)

Dylann Roof is led from a North Carolina police station after his arrest in June 2015 for the mass shooting of nine worshippers at Charleston's Emanuel AME Church. File/AP

Convicted mass killer Dylann Roof will be sent to a federal prison to await execution once his state murder case concludes next week with a scheduled guilty plea, according to newly filed court documents. 

Roof, 22, is expected to plead guilty to state murder charges on April 10, sparing his nine victims' loved ones a second grueling death penalty trial and ensuring he spends the remainder of his life in prison.

Roof was convicted in January of 33 federal charges, including hate crimes, and sentenced to death for killing nine black worshippers at Charleston's Emanuel AME Church. However, 9th Circuit Solicitor Scarlett Wilson also was pursuing the death penalty for nine state murder charges, proceedings that had been on hold since the end of Roof's federal trial.

She let families of Roof's victims know last week that she is accepting a guilty plea instead.

Roof has been held at the Charleston County jail while his state charges are pending. After his plea, however, Roof is expected to be moved from the local detention center to a federal Bureau of Prisons facility, according to a memorandum of agreement filed by federal prosecutors Sunday. The agreement was signed by Roof, his lawyers and Wilson.

Male prisoners sentenced to death usually are housed at a prison in Terre Haute, Ind., site of the federal execution chamber.

Meanwhile, the judge in Roof's federal case is weighing which of the dozens of sealed documents from that trial should be unveiled to the public. Among them are psychiatric evaluations of Roof and transcripts of two closed-door competency hearings that could shed light on the mental state of a young man who killed innocent African-Americans in a church to inflame racial tensions. 

Reach Glenn Smith at 843-937-5556 or follow him on Twitter @glennsmith5.