In sequence diagrams, you can delete a lifeline to remove
a participant from an interaction.
To delete a lifeline:
- Open a sequence diagram that contains at least
one lifeline.
- In the interaction frame, right-click a lifeline; then
click Delete from Model. All
send and receive messages that originate from the deleted lifeline
and all interaction fragments that cover the lifeline are deleted.
The combined fragments and interaction occurrences that cover other
lifelines are not deleted.