それっきり

since then; ever since

s o̞ ɾ e̞ k̚ʲ kʲ i ɾʲ i → 其れっきり
それ that, it + っきり only; nothing more
adverb Rare #33,296
since then; ever since Often implies that something has not happened again or that contact has ended since that time.
JA: 彼とはそれっきり会っていない。
EN: I haven't seen him since then.

それっきり消息不明です

There’s been no word from them since then.

— サイコ (1960)

野球はそれっきり

That was the end of my baseball career.

— フィールド・オブ・ドリームス (1989)

西側女と逃げてそれっきり

He ran off west with another woman, and that was the last anyone heard of him.

— グッバイ、レーニン! (2003)

それっきり

That was the last I ever heard of it.

— コーカサスの虜 (1996)

それっきり

And that was the last I ever saw of them.

— ファイト・クラブ (1999)