The teen stepbrother accused of killing and sexually abusing Anna Kepner during a Caribbean cruise was finally taken into custody in Florida on Monday, the Daily Mail can reveal. 

Timothy Hudson, 16, surrendered to the US Marshals Service at 8am, according to a newly unsealed court order.

The baby-faced defendant will now be held at a state-run juvenile detention facility in the Tampa area ahead of his September trial.

Timothy was sharing a cabin with his 18-year-old stepsister when she was found raped, strangled and stuffed under a bed aboard the Carnival Horizon in November last year. 

Prosecutors have alleged he was 'obsessed' with his stepsibling at the time of the slaying. 

'We have evidence he was obsessed with his sister. He had a crush on her,' prosecutor Alejandra Lopez said during a court hearing last month. 

He was charged with first-degree murder and aggravated sexual abuse in February but released without bond under the Juvenile Delinquency Act to live with his uncle. 

The secretive federal case was finally unsealed in March when Timothy, whose mom Shauntel Hudson is married to Anna’s dad Christopher Kepner, agreed to be tried in US District Court as an adult defendant. 

Prosecutors immediately asked Judge Edwin Torres to review his earlier release order because the youngster’s custody arrangements now fall under the much tougher Bail Reform Act. 

They argued that Timothy, who is accused of the ‘most serious, egregious, and violative crimes one person can inflict upon another,’ should not be around other kids. 

Judge Torres agreed to take the boy into custody but not immediately.

Anna, of Titusville, Florida, had been sharing a room with Timothy and her half-brother when the grisly slaying unfolded en route from Mexico to the US. 

The Daily Mail was the first outlet to report that Anna’s body was found stuffed beneath a bed in the cabin. 

She had been wrapped in a blanket and covered with life preservers, according to sources. 

Bruising to Anna’s neck suggested Timothy squeezed his step-sibling’s throat for three to five minutes until she died from mechanical asphyxiation, prosecutors told a previous court hearing. 

The attack was so ferocious that her eardrum allegedly burst. 

Anna had gone to bed early the night before, telling her family during dinner that her braces were hurting. 

While her half-brother wandered the ship taking photos, she was left alone with her stepbrother who takes medication for ADHD and insomnia. 

When the younger boy returned, he did not see Anna but assumed she was staying up late with Christopher, Shauntel, or her grandparents Jeffrey and Barbara Kepner. 

He climbed into his bunk and went to sleep - unaware, sources say, that his sister’s body was hidden just feet away beneath her bed. 

It was not until the next morning when the two boys headed to breakfast that the family realized Anna was missing.

By then Timothy had thrown her cell phone into a trash can, according to prosecutors.

Dad-of-three Christopher, 41, was alerted to the cheerleader’s plight when a medical emergency was announced over the ship’s public address system.

He entered her Deck 8 cabin moments after a cleaning crew had discovered the body.

'I checked her pulse. I pulled her out from under the bed. I knew my daughter was dead long before the medical examiner got there,’ the heartbroken dad previously told the Daily Mail.

FBI agents swarmed the ship, interviewed the family and scoured CCTV cameras when the Horizon returned to Miami on November 8.

Timothy has pleaded not guilty and invoked his right to remain silent. 

Eric Cohen, Timothy's public defender, has conceded that Timothy and Anna likely had sex but he’s claimed there isn’t enough evidence to determine that it was non-consensual.

Anna planned on entering the US Navy or becoming a K9 handler in the Titusville Police Department after graduating high school.

She had chronicled her love of travel on TikTok and been on several cruises.

‘Anna was pure energy: bubbly, funny, outgoing, and completely herself,’ relatives wrote in her obituary.

Mourners at her November memorial service were encouraged to wear bright colors instead of black ‘in honor of Anna's bright and beautiful soul.’

Timothy faces decades in prison if convicted. 

He cannot face the death penalty because he was a minor at the time of the alleged slaying.