when (someone) passed away
이 집 아저씨 교통사고로 돌아가셨을 때 여기 뭐 하러 왔어요?
What were you doing here when the man who lives in this house died in a car accident?
— Oasis (2002)
톰은 어머님이 교통사고로 돌아가셨을 때 세 살 이었어.
Tom was three years old when his mother died in a car accident.