On this season of Missing Pieces, reporters Grace White and Matt Keyser are investigating the murder case of Sandra Melgar. She's serving 27 years in prison for the brutal murder of her husband, Jaime "Jim" Melgar, the night they celebrated their 32nd wedding anniversary. Why are there so many questions about her guilt?

On this episode:Where does Sandra Melgar’s case go from here? She is fighting her conviction, but an appeal is a long process and doesn’t guarantee she will get out of prison. And as one law expert told us, going through the appeals court isn’t the best way to prove a wrongful conviction.

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Missing Pieces: Season 2 Episode 6: The Appeal

Read more: She's convicted of murdering her husband. Did she do it?

Watch: The murder case against Sandra Melgar

How this story was reported: Reporters Grace White and Matt Keyser spent months reviewing the case file, provided by the Harris County District Attorney’s Office. That was complete with original police reports, investigators’ notes and interrogation tapes, crime scene photos, and Jaime “Jim” Melgar’s autopsy report. White and Keyser spoke with prosecutor Colleen Barnett, who provided great detail about the state’s case against Sandra, and family members of Jim and Sandra, who provided valuable insight into their life and marriage.

If you have any questions or information about the case, email Grace and Matt.

Photos: Behind the scenes of 'Missing Pieces' Season 2