How do I exit a window manager (StumpWM) and X11 session launched with `dbus-launch --exit-with-x11 stumpwm`?

I have in my .xinitrc the line dbus-launch --exit-with-session stumpwm. Occasionally, I'll want to kill everything that has to do with X, get back to a terminal, and start over. If I ps aux | grep stumpwm and kill the StumpWM process, the window manager dies, but everything with x11 still works. I can type in the window that currently has focus but I can't change focus or do any other window management. I also tried sudo kill -9 startx, no effect. I noticed another "x" process, xinit, and killing that also had no effect.