▲同意陈老师的分析：这里的 the night 起连词作用，引导时间状语从句，意思是“……的那个晚上”，与 the minute, the moment, the instant 等的用法相似。句意为：

The night she won Olympic gold in Beijing, the routine murders in Waterhouse and the drug wars in the neighbouring streets stopped. 在她在北京赢得奥运金牌的那个晚上，水屋司空见惯的凶杀以及附近街道上打击毒品的斗争突然都停止了。

另外，the day, the week, the month, the year, the spring, the summer, the autumn, the winter 等也有类似用法：

It was very wet and windy the day I drove over the hill to Del Norte. 我开车越过小山去德尔诺特的那天下大雨又刮大风。

Her parents started putting away money for her education the year she was born. 她的父母在她出生的那一年就开始为她的教育存钱。

The week he died, we all sat around and moped. 他去世的那个星期，我们都闷闷不乐地闲坐着。

▲但与陈老师看法不同的是：我认为这里加上介词 on 也是可以的——这样一来，on the night 就成了时间状语，其后的 she won Olympic gold in Beijing 为定语从句，修饰 the night。类似的用法如(下面一句中的 on 可以省略)：

Three months later lan was dead. Luckily she had not been with him on the night he lost control of his car and careered into the woods. It was after that tragedy that Sharon decided to emigrate. 三个月后依安就去世了。所幸的是在他汽车失控冲进树林的那天晚上，她没有同他在一起。正是在这次悲剧之后谢尔润才决定移居外国的。