However, judging by Fang Dajiang's reaction, he likely didn't know much.
The murderer who killed my older brother was meticulous and exceedingly cautious in her actions. She wouldn't possibly disclose important information to someone else, even if that man was her intimate partner.
Yet, Lu Lingche couldn't figure out why a woman living in the deep mountains would go to great lengths to kill his brother, and why his brother had kept this woman's existence a secret, even buying a separate mobile phone and SIM card to contact her.
Before his brother died, he must have known who killed him. He also had time to send a message about who the murderer was, but his last words didn't mention the murderer at all.
If she were young, Lu Lingche might have considered the possibility of a crime of passion.