Bluebird fatality – what happened?

Question

I wrote earlier that I thought I had two female bluebirds sitting on one nest in my bluebird house. It turns out that it was a male and female. The female somehow killed the male bluebird inside the house. I have removed the dead male and the female is sitting back on the eggs. Have you ever seen anything like this? (I have a camera inside my house.)

Naturalist's Response

Do you have House Sparrows?

They are notorious for killing bluebirds inside the nest box.

I don’t believe a female bluebird would kill her mate.

-Naturalist Denise Wolfe

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