Dr.Armstrong

The 7th Victim (In reality the 6th Victim b/c Wagrave faked his death):
Dr.Armstrong from the 1945 version



Death of Dr.Armstrong(there he is falling)
When his body washes up on shore (Lombard and Vera
find him)

Description:
He's a Harley Street Doctor who is known for his high expertise.
When he first arrives in the island, he brings with him a bag full of medical supplies including the hypodermic needle(utilized to kill Emily Brent), potassium cyanide (used to kill both Marston and Emily Brent), and chloral hydrate(used to kill Mrs.Rogers)


Accused of:
The mysterious recording accuses Dr.Armstrong of killing a patient (Louisa Mary Clees) after operating on her while he was heavily intoxicated.

Death by:
After their accusations are revealed, Dr.Armstrong goes to help Mrs.Rogers who has fainted and doesn't contradict the fact that he killed Clees accidentally. Since he brought all the materials, used to kill many of the characters and eventually goes missing Lombard, Claythorne, and Blore suspect him as the killer. This is later proven untrue when Lombard and Claythorne find his bloody corpse washed up on the shore, which leads to the climax of the story.

"Four little Soldier Boys going out to sea;
red herring swallowed one and then there were three"  

Wargrave's Confession:
Wargrave's letter reveals that he and the doctor stroke up a deal where he(Wargrave) would pretend to be killed and secretly go investigate who the murderer is. Later on, Wargrave states that he met up with Armstrong outside and pushed him off the cliff(Red Herring line suggests that Armstrong was tricked b/c the red herring is an idiom often used to refer to something that misleads/distrusts or has been misled/distrusted.)