How can I kill a job that was initiated in another shell (terminal window or tab)?

If I begin a process and background it in a terminal window (say ping google.com &), I can kill it using kill %1 (assuming it is job 1). However if I open another terminal window (or tab) the backgrounded process is not listed under jobs and cannot be killed directly using kill. **Is it possible to kill this process from another terminal window or tab?** Note: I am using the Xfce Terminal Emulator 0.4.3 and bash (although if a solution exists in another common shell but not bash I am open to that as well)