Andrea Roth has signed up to join the cast of Lost in a recurring role.

The actress currently plays Denis Leary's long-suffering wife Janet Gavin in Rescue Me. It has not been confirmed what character she will play in the cult hit.

However, a recent Lost casting was looking for a female character in her 30s to play "a tough, no-nonsense and beautiful" therapist who can be "overly controlling and obsessive", leading to speculation that this is the part Roth has picked up.

It is expected that she will still star on Rescue Me and shoot her Lost scenes in Hawaii, before any filming for the fifth season of the former commences.