Hadith.4962 - Ibn Abi Umayr narrated from Sa'id al-Azraq, from Abu Abdillah (as), regarding a man who killed a believing man.
Imam (as) said
"It will be said to him, 'Die in any manner you wish, either as a Jew, or if you wish, as a Christian, or if you wish, as a Magian (Zoroastrian).'"