Marsh entered the pleas to 787 counts against him, including theft, abuse of a corpse, burial service fraud and making false statements.
"To those of you who may have come here today looking for answers, I cannot give you," Marsh told the family members in the courtroom.
A sentencing hearing was set for Jan. 31. In exchange for the guilty pleas, he is expected to receive a sentence that requires him to serve no more than 12 years in prison followed by probation.
Marsh, 31, allegedly stopped performing cremations at the Tri-State Crematory in Noble, Ga., in 1997, when he took over the family business. Based on an anonymous tip in 2002, authorities found more than 300 corpses on the property — scattered in the woods, in buildings and crammed into burial vaults and behind Marsh's house.
After an anonymous tip in February 2002, investigators found bodies scattered on the crematory property — in the woods, in buildings and crammed into burial vaults and behind Marsh's house.
Relatives have settled an $80 million lawsuit against Marsh, though it is unclear how much will be paid. A lawsuit against funeral homes that sent bodies to Marsh's crematory was settled for $36 million, and much of that has been paid.
Several dozen relatives have already told the prosecutor's office they are interested in speaking at the January sentencing hearing, and others plan to send letters to be entered in court.
Carol Bechtel of Coeur d'Alene, Idaho, plans to send a letter. "The thing I wanted was accountability," said Bechtel, whose parents were supposed to be cremated by Marsh. "If he does plead guilty, I'm OK with the Marsh family."
Marsh also is expected to plead guilty to corpse abuse in Tennessee, where some funeral homes that sent bodies to his crematory were located. That prison sentence would be served at the same time as the one he receives in Georgia.