Killing abandoned process on Heroku

I killed an IRB prompt in a not-so-graceful manner (started with heroku run irb), and now I've got a zombie process which I can't seem to kill:

Process       State               Command
------------  ------------------  ------------------------------
run.3         up for 2h           irb -r ./init.rb
web.1         up for 0s           thin -p $PORT -e $RACK_ENV -R $HER..

I've tried:

• heroku restart
• heroku ps:scale run=0
• heroku ps:restart run.3

Anyone know how I can force quit it?

I noticed a new ps:stop command added to the Heroku command line client a few days ago:
https://github.com/heroku/heroku/commit/a6d9eb7f314bf2c5f162a508e8d764286fb577bb

I'm not sure if that change made it into version 2.9.0 but it would be worth a try.

Update

This is now in the Heroku Toolbelt. Just run:

heroku ps:stop <process id from heroku ps>

Example:

heroku ps:stop run.8729

Thanks James!! I needed to update my Heroku client first, and it worked like a charm.

$ sudo gem install heroku

$ heroku ps #to view processes

$ heroku stop <process name here>