Ash Kelley

But detectives in Texas could see that the Mexican investigators were taking Mark's disappearance very seriously.

And they also were running all these tips down.

So that was nice.

Yeah.

So things are in motion.

They are.

But by the end of the month, investigators on both sides of the border weren't much closer to finding Mark Kilroy than they had on the day he went missing.

And it was starting to feel like he was never going to be found.

In order to feel like they were doing something productive and proactive, Jim and Helen withdrew Mark from school.

jim told reporters we're trying to find out what things we can do because we don't really know we're holding up well but it's a matter of what you can do how much can you do and you start to run out of things you can do to try to find mark yeah it's just awful it is now just as everybody was starting to lose hope that mark would ever be found there was a break in the case and it came in one of the most unexpected and innocuous forms

On the end, this is where we really take a hard left.

So bear with me, everybody.

All right, I'm here.

We're going into a completely different area here.

So in the afternoon of April 1st, Mexican police were conducting a checkpoint on Highway 2.

That's the main road that connects Matamoros to Texas.

OK, the setup was a simple drug checkpoint like countless others along the border, basically attempting to stop drugs from coming into or out of Mexico.

OK, now they're sitting there on this on this stop and they spot police spot a red truck they recognize coming down the highway.

And they quickly ran the plate and discovered that it belonged to Serafine Hernandez Garcia.

Now, at the time, the Hernandez family was well known to the police in Matamoros.