NEED TO KNOW

Anna Kepner was killed on a Caribbean cruise in early November

Authorities say she died from asphyxiation

Her 16-year-old stepbrother, who was sharing a room with her, is under heavy scrutiny but has not been publicly named a person of interest

Anna Kepner's grandmother is opening up about the slain teen's stepbrother, who is now possibly suspected in her killing aboard a cruise while they were on a family vacation.

Kepner, an 18-year-old high school cheerleader from Titusville, Fla., was found dead under a bed on the Carnival Horizon on Nov. 8.

Her death has since been ruled a homicide, according to a death certificate obtained by ABC News .

Authorities have not publicly named a person of interest in the case. But Kepner's 16-year-old stepbrother may be subject t

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