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Oklahoma court officials have been unable to serve a lawsuit against a former Oklahoma City police officer who is now jailed in another state after being convicted of sexually assaulting women while on duty.

Daniel Holtzclaw was sentenced to 263 years in prison after being convicted of rape, sexual battery and other charges in December. Seven women involved in the criminal case filed a federal lawsuit against Holtzclaw earlier this month.

But court records indicate efforts to serve Holtzclaw with the lawsuit have been unsuccessful because he can’t be located. Oklahoma prison officials said Holtzclaw is in prison in another state but will not disclose where he is housed for security reasons.

Prison officials said Thursday they are working with Holtzclaw’s attorneys to provide him with a copy of the petition.