Agatha Christie Deaths, Part 3.

It seemed again to be an illustration of the identical twin destiny. She walked in her sleep. Sometimes she took one too many tranquillisers and that resulted in her walking round the house and sometimes out of it at night. She was following a path along the cliff edge, lost her footing and fell over the cliff. Killed immediately - they didn't find her until the next day.
Pg 101, Elephants Can Remember (1972)

She was afraid. I loved seeing her afraid and I fastened my hands round her neck. Yes, even now when I am sitting here writing down all about myself (which, mind you, is a very happy thing to do) - to write all about yourself and what you've been through and what you felt and thought and how you deceived everyone - yes, it's wonderful to do, yes, I was wonderfully happy when I killed Greta...
Pg 185, Endless Night (1967)

She saw, as one sees in a dream, the bronzed limbs, the white backless bathing dress - the red curl of hair escaping under the jade green hat - saw something else too - the curious unnatural angle of the outspread arms. Felt, in that minute, that this body had not lain down but had been thrown...
Pg 55, Evil Under the Sun (1941)

Hercule Poirot gestured towards the picture on the wall. "I should have known when I first saw that picture. For it is a very remarkable picture. It is the picture of a murderess painted by her victim - it is the picture of a girl watching her lover die..."
Pg 187, Five Little Pigs (1943)

Mrs McGillicuddy looked into the lighted first-class carriage that was only a few feet away. Then she drew her breath in with a gasp and half rose to her feet. Standing with his back to the window and to her was a man. His hands were round the throat of a woman who faced him, and he was slowly, remorselessly, strangling her. Her eyes were starting from their sockets, her face was purple and congested. As Mrs McGillicuddy watched, fascinated, the end came; the body went limp and crumpled in the man's hands.
Pg 7, 4.50 From Paddington (1957)

"That's where she was found," said Mrs Oliver. "Someone, you know, someone had shoved her head down into the water with the apples. Shoved her down and held her there so that she was dead, of course. Drowned. Just in a galvanised iron bucket nearly full of water. Kneeling there, sticking her head down to bob at an apple. I hate apples," said Mrs Oliver. "I never want to see an apple again..."
Pg 21, Halloweén Party (1969)

There had clearly been a terrific struggle. Heavy furniture was overturned. China vases lay splintered on the floor. In the middle of the hearthrug in front of the blazing fire lay Simeon Lee in a great pool of blood... Blood was splashed all round. The place was like a shambles. Lydia's voice came like a fluttering whisper: "Who would have thought the old man to have had so much blood in him..."
Pg 56, Hercule Poirot's Christmas (1938)