The stepfather of Kiesha Weippart is to be sentenced in May over the killing of the six-year-old girl in western Sydney.

Kiesha was allegedly knocked unconscious by another person, who cannot be named, at her Mt Druitt home in July 2010.

Robert Smith, 33, has pleaded guilty to her manslaughter on the grounds of negligence and to being an accessory after the fact of murder.

During a brief appearance on Friday, the NSW Supreme Court was told that Smith, who was wearing a white shirt and had his short black hair slicked down, would not be putting forward further submissions on his sentencing.

Justice Megan Latham listed his sentencing for May 3.

Evidence was given to a court last month that after the little girl was injured, Smith left her in a "comatose" state when he went off to work, only to return home that night to find her dead.

After Kiesha died, the court heard Smith stuffed her body into a suitcase and left it in her room for about five days before he and his co-accused took it to a pre-prepared grave at nearby Shalvey on July 18, 2010.

"(Smith) then doused the deceased's body in petrol and set the deceased's body alight," crown prosecutor Keith Alder has previously told the court.

Kiesha was eventually reported missing from her home on August 1, sparking a large-scale police search and nationwide media interest.

Another person, who cannot be named for legal reasons, will stand trial for Kiesha's murder later this year.