Unable to shut down MySQL server I have tried using the system preferences and then shutting down MySQL there, but to no avail. I also tried typing killall -9 and -11. Both failed :(.

I also tried /usr/local/mysql/bin/mysqladmin -u root -p shutdown. The last thing I tried is in the following screenshot... it also did not work. 



I am using yosemite, if that matters.
Ideally you can shutdown using 

/etc/init.d/mysqld stop 


I cannot add comments so requesting to post what do you see in error log when you do

mysqladmin shutdown 


About kill commands please note that mysqld_safe is wrapper script which will start mysqld upon killing... so you should kill mysqld_safe first followed by mysqld. ( not a suggested way though).

Refer: how to stop mysql on mac