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I have the trash dialog box up, and it's frozen. What process needs to be killed in order to remove it, without having to restart?
Try killall Finder in Terminal.app.
Relaunch the Finder if you don't want to use the terminal.
Apple menu > Force quit... > Finder > Relaunch.
If you want to stop ONLY the Empty Trash process, open the Activity Monitor utility and force quit the Locum process.
Enter your admin password when requested.