The intruders strangled the lady to death.

Thrashed : beat (a person or animal) repeatedly and violently with a stick or whip.
Forced : obtained or imposed by coercion or physical power.
Compressed : flattened by pressure; squeezed or pressed together.
Throttled : attack or kill (someone) by choking or strangling them.
Strangled : squeeze or constrict the neck of (a person or animal), especially so as to cause death.

Synonym of Strangled is Throttled