For nearly five years, ABC Action News has followed the mysterious death of Sheena Morris.
The 22-year-old was found dead inside a hotel room on Anna Maria Island on New Year's Day in 2009.
Bradenton Beach police found Sheena hanging in the shower and ruled her death a suicide.
The ruling was later changed to "undetermined" by the medical examiner.
Now her mother, Kelly Osborn, is on a mission to find the truth.
Osborn has been profiled several times on ABC Action News. She spends all of her free time trying to uncover the mystery surrounding her daughter's death.
Tonight, the mystery is the focus of 20/20. We talked with ABC News anchor David Muir for a preview.
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Watch Kelly Osborn's story tonight on ABC News 20/20 at 10 p.m. on your ABC Action News Station.