Janet McKenzie (Witness for the Prosecution)

In the stage play Witness for the Prosecution, Janet McKenzie is the maid of Emily French.

Janet appears in the stage play where she gives her testimony, Sir Wilfrid Robarts remarks on the fact that she might be painting her picture of Leonard Vole out of envy for him taking a big inheritance from her and that he notices that she hold her hand to her ear that she might not of heard Vole before French's murder due to the fact she is waiting for a Hearing Aid from the NHS and couldn't hear Robarts speaking quietly thus leaving her statement a little questionable.

1957 film
In the 1957 film, Janet McKenzie is portrayed by Una O'Connor.

Janet is given a extra scene where she is appears in Vole's retelling she sees French come back with him and gives him a grumpy look clearly doesn't hide her hate, when she sees his Egg Beater/Separator she cares little for it throwing it at the sink and tries everything to get Vole to know he's not welcome.

At the end Vole says that he will buy Janet the hearing aid.

1982 film
In the 1982 film Janet McKenzie is portrayed by Wendy Hiller.

Janet was given a extra scene for the opening of her going to get a sewing pattern and then finding French's corpse.