They did not immediately say, "We have your DNA, and it matched the crime scene DNA." Instead, what they told him was a little more cryptic

From the crime scene, we have DNA from the person who was there when Leslie died.

So there's Leslie's blood all over the place, obviously, um, but then there's also another DNA profile that was picked up from the crime scene, and we wanted to find out more about you and if there was any kind of situation where you could have been at the house at that time.

Based on all of this evidence, what do you think happened to Leslie that morning when she was killed?

I think that Eugene thought no one was home and didn't expect for Leslie to be there, and she came downstairs and confronted him.

And I think in his mind he realized he was caught because it's not just a stranger, it's somebody who knows exactly who he is.

And instead of just admitting that he was wrong or, or talking to her about it, I think that he just panicked and only thought about himself and made a selfish decision to kill Leslie in the heat of the moment, um, just so he could get away.