1. Emily Ingelthorp
Yes - care to be more specific?
2. Arlena Marshall
3. Linnet Ridgeway Doyle
Yes - on both counts!
4. Ruby Keene - The Body in the Library - pdurrant
5. Mr. Ratchett
Yes - on both counts
6. Henry Morley
Wrong on both - hint - different method for each victim.
7. Thomasina Tuckerton
8. Marlene Tucker
9. Rex Fortescue
10. Madame Giselle
11. Hercule Poirot - Curtain - pdurrant
Close, but not quite.
See my comments above - great start!
[Harder than it sounds, right? Who notices a dead body .... or two?]