Sequence diagram: "kill" a participant

[muja]

Is it possible to kill an actor early so their vertical end-position is higher than the current default end-of-diagram?

Specifically, what I am looking for is a counterpart to create Participant which specifies a vertical start-position. I looked into destroy Participant, but that only X'es out the participant, it still "lives on".

In particular, my use case is this: I have 3 services, one of which only acts as a mediator in the beginning. So once Service 2 is done connecting Service 1 and Service 3, Service 2 is not used anymore, Service 1 and Service 3 communicate directly. Service 2 still being in the middle, though, makes the diagram confusing as to why Service 2 is still there.