The reason that I'm here is we're taking a look at all of the unsolved homicides in the

case, basically in the county.

Earl Marshall up at the Cozian, you remember that one?

Yep, that chat through the door and door.

I've got Weinberger, investigative journalist and former deputy sheriff.

I'm Anna Sige-Nikolasi, former New York City homicide prosecutor and host of investigation

discoveries to conviction.

And this is an out of me of murder.

Today we're talking about a cold case that has really haunted a small town for over 40

years.

I spoke with Detective Sergeant Adam Mercer, who really has a legacy with the department

he works for the New Wago County Sheriff's Office.

My dad is a retired sheriff of New Wago County and both my brothers and I became police officers.

Working for the public has really become the Mercer Family Business.

I believe I was called to do this job, similar to teachers, healthcare workers and clergy.

Today's story spans more than 40 years, decades of suspicions, questions, after years of running

down leads, chasing theories, all of that led nowhere and the case just sat.

But in 2015, Detective Sergeant Mercer was tasked with picking up the case of Earl Marshall.

Adam decided to dust off the case files and begin to dig in.

Now the term cold case, it's not going to be unfamiliar to any of you.

Every detective, everyone picking up a cold case has a different strategy, but they all

start with the same thing.

...