To KILL a mysql process from SHOWED Processlist

to show the processlist and get the THREAD ID  to kill the process

 mysql> SHOW PROCESSLIST;

 
 use the KILL command followed by the thread ID returned by SHOW PROCESSLIST:
 mysql> KILL 27;
 Query OK, 0 rows affected (0.05 sec)
To kill the query being executed by a thread but leave the connection active (yes, MySQL even allows such fine-grained control), use the KILL QUERY command instead, followed by the appropriate thread ID.