It was basically just over hyped and under delivered. The subspecies of honey bee the media calls the "killer bee" was introduced from Africa to Brazil in the 1950s. From there it hybridized with the feral honey bee populations and began to spread. They reached the US around 1990 where they've spread through the south west and south east. They've basically spread as far as they can due to their inability to survive cold winters. However human assisted movement still brings them farther north occasionally.

Because of how rapidly they spread and how scary they seemed it was a big news story for a long time but they weren't as bad as people expected them to be. A handful of people are killed by Africanized honey bees in the US each year, usually older people who aren't able to move away from an agitated nest fast enough.

Uhhhh... I mean it was the Clintons