In February, Matthew Leili was convicted of killing his wife and leaving her in the woods at the front of their Gwinnett County subdivision, bringing a close to a years-long, mystery-shrouded saga.

On Sunday, the case will be featured on "Dateline NBC."

Nique Leili, 44, disappeared on July 8, 2011. Eight days later, a search party found her naked and decomposing body covered in leaves behind the entrance to her family's neighborhood, not far from the busy intersection of Russell and Collins Hill roads. Gwinnett County police almost immediately named Matthew as a suspect, but said they didn't have enough evidence to charge him.

He moved to Vermont with the couple’s daughters, 9 and 12 years old at the time, and the case remained quiet for years.

But on March 5, 2015, authorities suddenly announced that a new review of computer surveillance systems seized from the Leili home had produced enough evidence to "tip the scales." Matthew Leili was arrested in Atlanta after attending a federal court hearing regarding proceeds from his wife's life insurance policy.

Leili was convicted on Feb. 5 of this year, after a week-long trial that garnered national media attention. He was sentenced to serve life in prison.

The case will be featured on "Dateline NBC" at 10 p.m. Sunday. Watch the preview video below:

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