Why did the killer strangle him after that?

Lisa comes down to the cellar to get more wine when the killers abducted her and strangles her to death.

The killer catches up with her though and strangles her to death.

The masked killer knocks out the policeman on guard and then strangles Vivian while she's bathing.

In London, a serial killer is raping women and strangling them with neckties.

Analyses of the crime scenes suggest that the killer usually stands behind the victim and then strangles her with an article of her own clothing.

Police said they suspected her killer lured Airi away as she was walking home and strangled her soon afterwards.

Ramasamy tried to help her but the killers caught and strangled her.

He said the killer apparently strangled Ms. Stinnett with a rope or wire and then used a knife to open her abdomen.

The killer finds Cindy upstairs and strangles her to death with a pair of bowling sneakers.