Discovery Channel’s first true-crime series, Killing Fields, draws to a close on
Tuesday evening -- but will it be able to finally get to the bottom of an
unsolved murder that has plagued Detective Rodie Sanchez for 19 years?

In ETonline’s exclusive look at the finale, Sanchez and his
new partner on the case, Det. Aubrey St. Angelo, have zeroed in on a suspect. Now,
they just need to get the DNA evidence to link him to the murder of Louisiana
State University graduate student, Eugenie Boisfontaine, who would have celebrated her 53rd birthday on Tuesday.

MORE: 'Killing Fields' Promises to Be the Next True-Crime Sensation

Shot in real time, executive producer Tom Fontana explains
to ETonline that the show had to prepare for every outcome. “The team had three
possible ways for the finale to go, so we were prepared for any eventuality,”
he writes via email, revealing that they had to work “very quickly” to get
everything together for tonight’s episode.

MORE: 13 Stages of Being Addicted to 'Serial'

And unlike The Jinx
or Making a Murderer, there was also
the possibility of no resolution at the end of the series. “We may not resolve
the case, but just like in life, certain things aren't answered,” executive
producer Barry Levinson told The
Hollywood Reporter ahead of the show’s debut. Luckily for fans and
producers alike, Discovery recently ordered six new episodes of the show,
continuing the investigation into the case.

So, what does that mean for the finale -- and where the show
will go over the next six hours? “You’ll have to wait and see,” Fontana teases.

Killing Fields airs
Tuesdays at 10 p.m. ET on Discovery.