You can see the process IDs for any of your currently running programs with the command: 

/bin/ps -u username


where username is your College of Engineering username.  This will give you output similar to the following: 
% /bin/ps -u someuser
  PID TTY      TIME CMD
28103 tty4a    0:00 matlab
28124 tty5c    0:00 ps
27545 tty5c    0:00 bash


In this list, find the name of the crashed program (in this example, 'matlab') in the column labelled 'CMD'.  To the left of this, in the first column, you'll see the process ID for that program, i.e. '28103'.    

Using the process ID (PID), send the program a termination (SIGTERM) signal, telling it to exit: 

kill pid


where pid is the process ID number you just found. 

Here is a full sample session, showing the prompts, commands, and responses. 

% /bin/ps -u someuser        <-- Look at all processes I am running
  PID TTY      TIME CMD
28103 tty4a    0:00 matlab   <-- Defunct process running on another terminal
28124 tty5c    0:00 ps
27545 tty5c    0:00 bash
% kill 28103                 <-- Send the program a SIGTERM signal
% ps -u someuser             <-- Check to make sure it worked
  PID TTY      TIME CMD
28125 tty5c    0:00 ps
27545 tty5c    0:00 bash

 

If the kill command does not kill the process,  try  kill -9 pid instead and check the process list again.  kill -9 will send a SIGKILL signal, which is a more aggressive command to quit the program.