The Mississippi Supreme Court wrote in an order that Edgar Ray Killen's notice of appeal on the revocation of bond was faulty and required more information than was provided.
Defense Attorney James McIntyre, contacted by The Associated Press, said he had not seen the order but the appeal will be re-filed.
The Supreme Court says the appeal should include, among other things, information on the defendant's employment, finances, family ties, character and mental condition, prior convictions and the crime of which he was convicted.
The 80-year-old Killen was convicted by a Neshoba County jury on June 21, 2005, of three counts of manslaughter in the 1964 slayings of James Chaney, Andrew Goodman and Michael Schwerner, civil rights volunteers who were working in the Philadelphia area. Killen was sentenced to 60 years in prison.
Last month, a judge revoked Killen's appeal bond after hearing testimony that Killen had been seen driving around the Philadelphia and Union areas.