真凶

zhuī chá zhēn xiōng

追查真凶

trace the real murderer

tā shēng chēng zì jǐ wú gū bìng dā ying bāng jǐng fāng zhuā dào zhēn xiōng

他声称自己无辜，并答应帮警方抓到真凶。

He protested his innocence and promised to help police track down the real murderer.

zhēn xiōng rèn zuì le

真凶认罪了。

The real murderer pleaded guilty.