any way to kill one windows from anther window?

[ping]

I run into a strange issue now (for the 1st time), one window is running into a sick, weird condition while all other windows are fine.
that window is blinking all the time and no command or keystroke can be accepted. I'm running some important task on other windows so I need this screen instance.
even c-a k doesn't work. I guess I can manage to find out that shell PID and kill it, but I'm running around 20 or more bash instance I guss so it's hard.
I'm seeing cpu spike to 50% by this screen instance.
question is, is there a way to kill a windows from another window?


regards
ping