org-special-ctrl-k

org-special-ctrl-k is a variable defined in `org.el'.
Its value is

nil

Documentation:
Non-nil means `C-k' will behave specially in headlines.
When nil, `C-k' will call the default `kill-line' command.
When t, the following will happen while the cursor is in the headline:

- When the cursor is at the beginning of a headline, kill the entire
line and possible the folded subtree below the line.
- When in the middle of the headline text, kill the headline up to the tags.
- When after the headline text, kill the tags.

You can customize this variable.