Turned into a different man, became a different man.
He completely changed in his behavior, in his way of life or in his manner of thinking.
(Modern Hebrew)
Translation
Expression (Hebrew)
הָפַךְ לְאָדָם אַחֵר, הָיָה לְאָדָם אַחֵר
Definition (Hebrew)
הִשְׁתַּנָּה לְגַמְרֵי בְּהִתְנַהֲגוּתוֹ, בְּאֹרַח חַיָּיו אוֹ בְּצוּרַת חֲשִׁיבָתוֹ.
(הָעִבְרִית הַחֲדָשָׁה)