Anna Kepner’s death on board a Carnival cruise ship is now ruled a homicide, according to her autopsy report, stating she was “mechanically asphyxiated by another person or persons.”

The medical examiner also finds two bruises on the side of Anna’s neck, writing she may have been held in a ‘bar hold,’ meaning her attacker held an arm across her neck. Anna’s stepbrother may be a suspect in the teen’s murder; the FBI remains silent.

Anna Kepner’s cruise to the Caribbean is a family trip. She’s joined by her grandparents, who took her on her first cruise; her father, Chris Kepner; her stepmother, Shauntel Hudson; and her two siblings and two step-siblings.

Anna’s parents share a room with the two youngest girls, and by their own decision, Anna, her brother, 14, and stepbrother, 16, split a second room. Grandparents Barbara and Jeffrey Kepner remind the teens they have a spare bed in their room if anyone decides they need more space.

During dinner, Anna excuses herself early; sources allege her braces hurt. Surveillance footage shows Anna walking back to and entering the room she shares with her brothers.

After eating, the teen boys come to the room before the youngest sibling ventures out again to explore, leaving Anna and their stepbrother alone.

When he returns, he notes Anna isn’t in bed but assumes she got a second wind and is spending more time with the adults. He goes to sleep with no idea his sister’s body is shoved under the bed just a few feet away.

Though family members released the details of Anna’s autopsy, and court records from stepmom Shauntel Hudson’s divorce proceedings indicate her 16-year-old son, Anna’s stepbrother, may be a suspect in the teen’s murder, the FBI has remained silent on the progress of their investigation.

No charges have been filed.

Anna’s stepmom, Shauntel Hudson, files a motion for a gag order in her divorce proceedings, claiming the public exposure and reporting on the case and subsequent filings could lead to "possible irreversible harm" to the children and family or could jeopardize the investigation and her son’s presumed defense.

The documents request future hearings be closed to the public in the event the 16-year-old is charged in Anna’s death.

Joining Nancy Grace today:

• Spencer Aronfeld - Trial Lawyer and Founder of Aronfeld Trial Lawyers, Author of illustrated children's book "Sara Rose, Kid Lawyer;" Facebook: Aronfeld Law, Instagram: Aronfeld_Trial_Lawyers
• Dr. Janie Lacy - Licensed Psychotherapist and CEO of Life Counseling Solutions, Author of "How To Heal From A Toxic Relationship: A Guide To Reclaiming Your Mental Health and Happiness," Host of “The Resilient Professional” Podcast on YouTube; Instagram & Facebook: @JanieLacy
• Robert Crispin - Private Investigator “Crispin Special Investigations," Former Federal Task Force Officer for the United States Department of Justice, DEA and Miami Field Division, and Former Homicide and Crimes Against Children Investigator; Facebook: Crispin Special Investigations Inc.
• Dr. Kendall Crowns -  Chief Medical Examiner Tarrant County (Ft Worth), NEW Podcast, "Mayhem in the Morgue," and Lecturer: Burnett School of Medicine at TCU (Texas Christian University)
• Shannon Butler (FL) Investigative Reporter at WFTV Channel 9 in Florida,
• Sydney Sumner - Investigative Reporter, 'Crime Stories'

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