2 sentences for 死罪 (sǐ​zuì)

1. 谋杀在许多古代社会都被视为死罪。

   móu​shā zài xǔ​duō gǔ​dài shè​huì dōu bèi shì​wéi sǐ​zuì.

   Murder was considered a capital offense in many ancient societies.

   Source: Dong Chinese Dictionary

2. 我竟然把这么重要的纪念日给忘了，真是死罪，请您原谅我。

   wǒ jìng​rán bǎ zhè​me zhòng​yào de jì​niàn​rì gěi wàng le, zhēn shì sǐ​zuì, qǐng nín yuán​liàng wǒ.

   I can't believe I forgot such an important anniversary; it's a capital offense, please forgive me.

   Source: Dong Chinese Dictionary