6 sentences

1. 你是怎么知道死因的？

   nǐ shì zěn​me zhī​dào sǐ​yīn de?

   How did you find out the cause of death?

   Source: OpenSubtitles

2. 警方正在调查他的死因。

   jǐng​fāng zhèng​zài diào​chá tā de sǐ​yīn.

   The police are investigating his cause of death.

   Source: Dong Chinese Dictionary

3. 有提及死因吗？

   yǒu tí​jí sǐ​yīn ma?

   Was the cause of death mentioned?

   Source: OpenSubtitles

4. 死因是什么？

   sǐ​yīn shì shén​me?

   What's the cause of death?

   Source: OpenSubtitles

5. 警方正在确认死者的身份及死因。

   jǐng​fāng zhèng​zài què​rèn sǐ​zhě de shēn​fèn jí sǐ​yīn.

   Police are working to confirm the identity and cause of death.

   Source: OpenSubtitles

6. 法医正在对这名受害者进行验尸以确定死因。

   fǎ​yī zhèng​zài duì zhè míng shòu​hài zhě jìn​xíng yàn​shī yǐ què​dìng sǐ​yīn.

   A medical examiner is performing an autopsy on the victim to determine the cause of death.

   Source: Dong Chinese Dictionary