Sherin went missing on October 7 and her body was found on October 22 in a culvert in suburban Dallas by a cadaver dog after an intense search. Her body was identified days later.
Sherin died of "homicidal violence", a law enforcement official in Dallas, Texas, confirmed to WFAA TV station, indicating the manner of death for the girl, nearly three months after she went missing from her home and was later found dead.
During a hearing in late November, a doctor testified before a court that Sherin, who was adopted from India, had broken bones and had injuries in various stages of healing, indicating abuse.
Initially, Sherin's foster father Wesley told police that he put her outside their home at 3 a.m. to discipline her for not drinking her milk.
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His story changed after her body was found in a culvert, telling police that he "physically assisted" with pouring the milk down Sherin's throat and then moved her body after he realised she had choked and died.
Wesley, 37, is charged with injury to a child, while the adoptive mother, Sini, 35, is charged with abandoning or endangering a child. Both are currently lodged in a Dallas jail.
The attorney representing Sini Mathews said the report, received on Tuesday evening from the Dallas County District Attorney's Office, does not implicate her in Sherin's death.
The report did not provide details of the autopsy conducted by Dallas Medical Examiner.
The news about the autopsy report on Sherin has reportedly been sent to Wesley and Sini as they are expected to appear in court later today for a Child Protective Services (CPS) custody hearing for their 4-year-old biological daughter. She was removed from the home by CPS officials after Sherin went missing.
The couple can either forfeit their parental rights during today's hearing, or the court could decide a date for a civil trial to possibly terminate their rights, the report said.
Last month, the couple, hailing from Kerala, temporarily lost their rights to see their biological child, who has been placed with a family member in the Houston area.
During the hearing, both Wesley and Sini pleaded the fifth amendment in court in response to pointed questions about their alleged involvement in Sherin's death to avoid self-incrimination.
Meanwhile, a community group has thanked the Richardson Police Department for its ongoing investigation into Sherin's death.
A group made up of Richardson residents presented police with a plaque yesterday, thanking them for their response and hard work in the complex and high-profile case that had attracted international media attention.
"To have the community come together and come to us and acknowledge the good work that the men and women of this police department have done means so, so much to us," said Richardson Police Department Chief Jimmy Spivey.