Yep, she's a vampire, and her cadaverous companion is her protector and procurer.
From the kentucky.com
But first, an approving nod to the dog himself, a cadaverous Giacometti-on-the-move.
From the guardian.co.uk
Tall, cadaverous, dressed in ripped jeans, brown jacket, black tie, battered trainers.
From the guardian.co.uk
Oggins'dossier contained a photo of a cadaverous man, the product of years of brutality.
From the washingtontimes.com
Curious, she peeks inside and sees a cadaverous man, Mr. Openshaw, smiling back at her.
From the suntimes.com
If this is your sample, then yes, the biopic does look cadaverous.
From the guardian.co.uk
The articles included pictures of her looking cadaverous.
From the nytimes.com
Her skin colour goes from hangover-grey to cadaverous blue.
From the independent.co.uk
Sure, it turned the patient's skin a cadaverous grey or blue-a permanent affliction known as argyria.
From the economist.com
More examples
Bony: very thin especially from disease or hunger or cold; "emaciated bony hands"; "a nightmare population of gaunt men and skeletal boys"; "eyes were haggard and cavernous"; "small pinched faces"; "kept life in his wasted frame only by grim concentration"
Of or relating to a cadaver or corpse; "we had long anticipated his cadaverous end"
Corpselike; hinting of death; imitating a cadaver
(cadaverousness) The state or quality of being cadaverous
Resembling, especially having the color or appearance of a corpse.