Hold down option-key whilst emptying the trash. Else reboot.

I'm surprised you didn't receive some kind of error message if you couldn't delete the file. OH ... did you empty the trash after moving the file there?

But then again ... I've heard there may be some type of bug with the beta LW 4.13 in regards to removing files from share that are being shared. That might be related. Also possibly extends back to 4.12 but not sure at this point. It's being looked at by the proggies.