Sandra"s body was found with a blood-soaked cloth knotted into a noose, and her official cause of death was listed as "homicidal asphyxiation," according to court records that had previously been under gag order.
The 2000 pages of transcripts include the testimony of forensic pathologist Dr. Bennet Omalu, who conducted the autopsy.
Omalu told jurors that the way the child's body was put into a suitcase after the killing showed that it was premeditated.
According to Omalu, the murder showed a "calm, calculating mind at work."
Testimony confirms it was Huckaby herself who led police to identify her as the only suspect in the killing.
Huckaby approached three FBI agents and two Tracy police officers the day after Cantu disappeared and gave them a handwritten note she said she had found near the community mailboxes at her trailer park. "CANTU LOCKED IN STOLIN SUIT CASE THROWN IN WATER ONN BACHCHETTI & WHITEHALL. WITNESS," the note read.
Huckaby told the group that her suitcase had been stolen the day before.
Cantu's body was not found until eight days later when the water level had gone down.
Testimony also reveals detectives visited Huckaby in the hospital eight days after the murder where she was admitted after swallowing a razor blade.
The documents show Huckaby told investigators she accidentally swallowed the blade while sleepwalking.
Testa told members of the grand jury the action showed the "consciousness of guilt."
Melissa Huckaby, 29, was sentenced Monday to life in prison without the possibility of parole after she pleaded guilty to murdering Sandra.
Their investigative summary said the girl had injuries to her external genitalia that were consistent with a bent, bloodstained rolling pin found inside a church where Huckaby had taught.