Transcript for The Final Chapter
mother gave up everything to become the lead investigator in her daughter's case when she says no else would, determined to find answers. The boyfriend who lost his fiance says, "all these years, he's been asking questions too," of the young girlfriend found in that shower. I ask the question all the time. I -- I asked it, "why did you do this?" I don't understand it. I mean, I -- I -- who -- who understands it? I don't. Reporter: Tonight, that team of investigators taking a second look at the case, and a florida prosecutor will decide what comes next. Will there be murder charges? Or will they agree with that first detective who showed up at that hotel, and found sheena in the shower, convinced it was a suicide. Reporter: What are you hoping to hear? I'm hoping to hear, my phone rings, and it's the fdle, the florida department of law enforcement, and say uh "miss osborn, we have a suspect in custody." Reporter: Will this ever be over? When there's a trial and the jury finds the suspect guilty. That chapter will be over. She needs some answers. The community, southwest florida would like to know what happened to sheena. Reporter: Do you think they'll ever know? Yeah, I do. I would be very surprised if they come back with a, "it was a suicide," because the evidence is overwhelming that it's not. Reporter: Joe, as you sit here across from me, have you gone there? Have you thought about possible charges at the end -- I'm not guilty of anything. Reporter: You don't fear there are charges coming? No, absolutely not. As a matter of fact, if anything, I think I should bring civil charges against kelly and her family. Reporter: Do you plan to? We'll see how it goes. I'm gonna wait till the investigations -- is over with. There's no reason why this family did what they did to me. Reporter: If they clear you once and for all, do you think that will be enough for sheena's mother? No. I don't think she'll ever stop. And sheena's friends don't want her to. Reporter: What do you think sheena would say? What do you think she would make of what her mother has done? I think she would be impressed. There was never one day one moment when we thought she would give up the fight and she won't. Reporter: And what do you think sheena would say to you? She'd tell me how much she loves me. She would tell me "i'm glad you knew mom, I'm glad you knew, and I'm glad you saw it through." A mother's unwavering devotion, and that team of investigators along with the prosecutor set to reveal whether they think there could be murder charges any day now. In the meantime, what do you think? Do you think this is a mother on the right path? Or is that fiance paying a price for her pain and suspicion, tweet us. That's our program for not, I'm
This transcript has been automatically generated and may not be 100% accurate.