Stepbrother of teen who died on cruise 'does not remember' what happened, teen's grandmother says

For the first time, the grandparents of 18-year-old Anna Kepner, who died on a Carnival Horizon cruise ship earlier this month, breaking their silence.

I just screamed. I couldn't stop screaming.

Barbara and Jeffrey Kepner were on board the seven-day cruise in the Caribbean with their son, his wife, and their grandchildren, enjoying time as a family. Anna staying with her brother and stepbrother in a stateroom seen here. Do you re

that you saw Anna? We had feeling well. She just sa I'm gonna go back to my r and she must have felt be dressed up and she came d in the casino. She didn't

she said, Me ma, I love y you. I'll see you later. And we never saw her again after that.

The next morning, an announcement over the ship's broadcast system changed everything.

They called for a medical alert team to go to a state room. And when they said the number, I recognized the number immediately. The room, Stuart, that was going in to clean the room, is the one that found her?

She was found concealed under the bed. I was told that she pulled back the mattress and found Anna.

What did the FBI say was the official cause of death?

The FBI contacted my son and family and told us the cause of death was a fixation. And

his grandmother said one possibility they're considering whether it was caused by a so called bar hold an arm across the neck. You take the elbow

like this. They said when they took her body to the medical examiner's office,

it was in perfect condition. Kepner telling ABC News they were told their granddaughter's body showed no signs of sexual assaults or drugs or alcohol in her system. In an unrelated custody dispute, Anna's stepmother calling Anna's stepbrother, who is a minor, a suspect in Anna's death. Do you think he had anything to do with Anna's death?

I mean, he was in a room with her. He was the only one seen coming and going so. I can't I can't accuse him because I don't know what happened in that room. But the summation would be that. That he did something and has he

said anything to you about what

happened? I heard him in his own words say he does not remember

what happened and his grandmothera say he does not remember

grandmother says she sat the stepbrothers intervie

He was an emotional mess. speak. He couldn't believ

and his grandparents say

were close. They were jus

sister. What else could y

him that he was a good st He played soccer, very qu had demons I think in his trying to deal with those

has not been arrested or attorneys for both the st did not respond to abc. The FBI and medi also declined to comment now on honoring their gra senior and straight a stu

join the military. She ha

to do things. This little she, she was mighty, very mighty.

We were looking forward to seeing her grow.

What do you hope for now in this moment for your family?

I hope that we can heal. Whatever happened in that room, the only person responsible is the person that was in the room with Anna.

What does justice look like for your family?

Whatever the law says, I'm not going to advocate for anything more or anything less. And that will be for the courts to decide.

We are still waiting for the official toxicology and autopsy reports to be released. Barbara and Jeffrey still don't know exactly what happened in that state room. They might never know. For now, they are grieving Anna, who wanted to join the Navy and had a bright future ahead.

Guys? Guys?

Absolutely thinking of Anna's family.