The 16-year-old stepbrother of Florida teenager Anna Kepner has been officially charged as an adult in her killing after she was found dead aboard a cruise ship in 2025, the U.S. Department of Justice announced Monday.
According to court records, the Titusville teenager, identified by federal prosecutors with his initials “T.H.,” was traveling on Carnival Cruise Line’s Horizon with 18-year-old Kepner and other family members in November 2025 when the incident occurred during a Caribbean voyage, according to the DOJ.
Investigators said that while the ship was in international waters en route to Miami, the teenage stepbrother allegedly sexually assaulted and intentionally killed Kepner, according to the DOJ.
The Miami-Dade Medical Examiner’s Office later determined the cause of death to be mechanical asphyxiation.
“Our hearts go out to the victim’s family during this unimaginable loss,” U.S. Attorney Jason A. Reding Quiñones for the Southern District of Florida said in a news release. “A federal grand jury has returned an indictment charging serious offenses that allegedly occurred aboard a vessel in international waters. We will present the evidence in court and pursue this case with professionalism and care.”
Quiñones went on to say that Kepner’s stepbrother is presumed innocent unless or until he’s proven guilty.
The teenager was initially charged as a juvenile in February, and the case remained sealed until U.S. District Judge Beth Bloom ordered it transferred for adult prosecution.
According to the DOJ, Kepner’s stepbrother was charged with first degree murder and aggravated sexual abuse.
If he’s convicted in her killing, he faces a maximum penalty of life in prison.
Family member reacted to the indictment of Kepner’s stepbrother on Monday.
“I am glad that justice is starting and I am hoping she gets the justice she deserves,” said Chris Donohue Sr, Anna’s step grandfather. “Her life was cut short and we are saddened that we will not be able to see what a beautiful life she would have had.”
No court date has been set as of Monday afternoon.
“It was inevitable that the stepbrother would be charged as an adult,” said Dave Aronberg, former Palm Beach prosecutor who reviewed the indictment and has followed the case but is not involved. “The adult criminal justice system is better equipped to handle a 16-year accused of such violent crimes that result in death.”
A juvenile track in the federal courts would have allowed the defendant to potentially be released fro prison at 21-years-old regardless of how severe the crime was, according to Aronberg.
FBI Miami is investigating the case, and Assistant U.S. Attorney Alejandra L. López is prosecuting the case.