Use the ps command to get the process id (PID) of this process.
kill -9 (PID)
But, I'm surprised that monitors/supervises lighttpd daemon can stop other process.
https://www.mankier.com/8/lighttpd-angel

Try to reboot, it'll restart all services
reboot

Closing ssh session will not kill daemon:)

Next time please fillow recommendation by @Not Fuzzy warm, it have more sence and less risky than patch application.