Agatha Christie Deaths, Part 4.

Hercule Poirot realised that this artificially-set scene had a point of reality. For what he was looking down at was, if not a dead, at least a dying man... He darted a quick glance at the woman who stood there, revolver in hand. Her face was quite blank, without feeling of any kind. She looked dazed and rather stupid. "Curious," he thought.
Pg 71, The Hollow (1946)

"Such an awful thing has happened," I read. "You remember Dr Rose's little cottage on the cliff? It was swept away by a landslide last night, the doctor and that poor nun, Sister Marie Angelique, were killed. The debris on the beach is too awful - all piled up in a fantastic mass - from a distance it looks like a great hound..."
The Hound of Death (1933)

She gave a strangled cry which died in her throat. In the dim light of the doorway stood a familiar figure with chestnut beard and whiskers and an old-fashioned Victorian coat. Patrick had come for her! Her heart gave one terrified leap and stood still. She slipped to the ground in a huddled heap. There Elizabeth found her, an hour later.
Wireless (1933)

"To your long life and to that of your husband," he said significantly, and raised his tea to his lips. Then his face changed. It contorted horribly... he tried to rise - to cry out... His body stiffened - his face went purple. He fell back sprawling over his chair - his limbs convulsed.
Mrs Merrowdene leaned forward, watching him. A little smile crossed her lips. She spoke to him, very softly and gently... "You made a mistake, Mr Evans. You thought I wanted to kill George... How stupid of you - how very stupid."
She sat there a minute longer looking at the dead man... Then she raised her voice and called: "George, George! Oh, do come here! I'm afraid there's been the most dreadful accident..."
Accident (1934)

Bryan Martin sighed. "You don't understand. Jane is not an ordinary murderess. She has no sense of right or wrong. Honestly, she's not responsible."
Pg 45, Lord Edgware Dies (1933)