Andrea Canning

And it all started, actually, from the night that EMTs responded.

On body camera footage, we hear some of them wondering, how did this healthy young dad die?

A month later, there was an answer.

Former homicide detective Wayne Nichols reviewed the case for Dateline.

The results of the toxicology come back weeks later.

And it's stunning to a lot of people in Eric's world.

Fentanyl is 50 times stronger than heroin.

It's a painkiller that some abuse because of its intense high.

At the time of Eric's death, paramedics suspected he may have taken drugs, so they administered Narcan, but it had no effect.

What made it even harder to fathom was the amount of fentanyl found in Eric's system.

He had a lot, a significant amount of fentanyl in his body, more than five times what is considered a lethal amount of fentanyl.

And the ME confirmed the fentanyl was street made, not prescription grade.

Eric is a dad.

He's a businessman.

He wasn't really known as some type of drug user in the community.

What does law enforcement do with that when that's sort of the bio you've been given about Eric Richens?

Eric's friend Gabe couldn't believe it.

What did you think when you heard fentanyl was the cause of death?

Corey told deputies they had both taken marijuana edibles in the past.

Is there any possibility of THC gummies being laced with fentanyl?