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I also faced the same issue when I closed the turtle simulator by pressing CRTL+C from terminal, but the name of the node "/turtlesim" remains in the node list.

Then, I tried to kill the node manually by using rosnode kill command. But no use.

Finally, this command cleans up the unreachable node. "rosnode cleanup" This command remove the unreachable nodes from the ros server. Finally, the name of the node removed from the rosnode list.

link : http://wiki.ros.org/rosnode#rosnode_cleanup