своей жены

of his wife; his wife’s

→ свой
phrase Rare #28,238
of his wife; his wife’s Своей is a reflexive possessive that refers to the subject of the sentence. Жены is the genitive form of жена, used here after смерти (“death”).
RU: Он винит вас в смерти своей жены.
EN: He blames you for his wife’s death.

Том на три года старше своей жены.

Tom is three years older than his wife.

Том умер на год раньше своей жены.

Tom died a year before his wife.

Он винит вас в смерти своей жены.

He blames you for his wife's death.

— Звёздный путь 2: Гнев Хана (1982)

Том читает дневник своей жены.

Tom is reading his wife’s diary.

Том винит тебя в смерти своей жены.

Tom blames you for his wife's death.

Бедняга, он никак не может пережить смерть своей жены.

Poor thing, he just can't get over his wife's death.

— Ребекка (1940)