Quick question about capitalization in dialogue.

Hi all, I have a quick question about capitalization in dialogue, specifically whether the second part of dialogue is capitalized after the dialogue tag in cases where the first part finishes with an exclamation point or a question mark.

Example:

“Jenny!” he called to his wife, “What happened to us?”

So is the "W" in the word what supposed to be capitalized, or not?

I find this a bit confusing because it would seem not, but that doesn't seem proper when an exclamation point or question mark serves to "end" the first part. Thanks in advance for your help!