Photos key in Louisiana family's quest to prove Megan Parra's death was a homicide

On a steamy summer morning in 2014 in the tiny Southern town of Cottonport, Louisiana, Steve and Missy Ducote faced the unthinkable. CHRIS KNIGHT (police interview): The way the body was positioned and the blood splatter and the gun that it actually was a suicide. CHAD JEANSONNE: What Detective Knight basically wanted to know was … could I determine if this was a suicide or not? I said, no, it's not that simple. DAVID LEMOINE: Why not? CHRIS KNIGHT: Because I looked at it as a suicide and not homicide. … JUSTIN CHENEVERT: Go ahead and state your name for me. ZACK SHELTON: Was there any arguing going on, any fighting going on? DUSTIN PARRA: In the middle of the night, she'd come wake me up. I can't stop thinking that my kids wouldn't go to heaven if something happened to them. ZACK SHELTON: Did you have affairs? DUSTIN PARRA: I slipped in a pool of blood at her — at around her head. DAVID LEMOINE: Somebody planted this note after she died, who could that have been? DUSTIN PARRA: I feel like y'all trying to incriminate me. DUSTIN PARRA: All right, I'm done guys. ANN GUILLORY: A little after 7 a.m., I heard a boom (claps hands), a loud boom.

Steve Ducote: I wouldn't know how to tell you. I've never felt like that before or since. CHRIS KNIGHT: I have no idea. CHRIS KNIGHT: If I botched this, you know, then I mean, I'll take the butt — my fault, you know? But was it done — but was it done on purpose? Absolutely not. DUSTIN PARRA: Dustin Parra. DUSTIN PARRA: Not in — not anything that a normal married couple would go through. DUSTIN PARRA: Yes … DUSTIN PARRA: I really don't know. DAVID LEMOINE: You need to come clean, and you need to say, we got in a fight and maybe she grabbed the gun first … DAVID LEMOINE: And you clearly heard it?

The couple found their youngest daughter Megan Parra lying on the floor of her living room. ZACK SHELTON: Did she know about it? ZACK SHELTON: Maybe she shot herself in front of you. I don't know, but you were there. ANN GUILLORY: Oh, yes, it was very loud 'cause I said to myself, "Oh my gosh, that was a loud noise."