His blood is hanging on his neck
Liability or responsibility for his death rests upon… Figuratively:… guilty of his own demise.
(An incident occurred where a man was about to kill. They said to him: "Say, 'Let my death atone for all my sins.'" He said: "Let my death be atonement for all my sins except this sin. If I committed it - may I not be forgiven, and the court of Israel be pure." When the matter came before the sages, their eyes welled with tears. They said: "There is no possibility to return him, for the matter has no end, except that his blood is hanging on the neck of the witnesses." - Jerusalem Talmud Sanhedrin 6:3)
Translation
Expression (Hebrew)
דָּמוֹ תָּלוּי בְּצַוָּארוֹ שֶׁל...
Definition (Hebrew)
הָאַשְׁמָה אוֹ הָאַחְרָיוּת לְמוֹתוֹ רוֹבֶצֶת עַל..., בְּהַשְׁאָלָה: ...אָשֵׁם בְּמוֹתוֹ.
("מַעֲשֶׂה בְּאֶחָד שֶׁהָיָה יוֹצֵא לֵהָרֵג. אָמְרוּ לוֹ: אֱמֹר "תְּהֵא מִיתָתִי כַּפָּרָה עַל כָּל עֲוֹנֹתַי". אָמַר:"תְּהֵא מִיתָתִי כַּפָּרָה עַל כָּל עֲוֹנֹתַי חוּץ מִן עָווֹן זֶה.אִם עֲשִׂיתִיו- אַל יִמְחֹל לִי וּבֵית דִּין יִשְׂרָאֵל יְהֵא נָקִי". וּכְשֶׁבָּא דָּבָר אֵצֶל חֲכָמִים זָלְגוּ עֵינֵיהֶם. אָמְרוּ:"לְהַחֲזִירוֹ אִי אֶפְשָׁר,שֶׁאֵין לַדָּבָר סוֹף, אֶלָּא הֲרֵי דָּמוֹ תָּלוּי בְּצַוַּאר עֵדִים"-יְרוּשַׁלְמִי סַנְהֶדְרִין ו, ג)