The murderer is a murder case that has been investigated for a long time and has not been solved. The officer angrily asked the detective, "Now that another person has been killed, when will you arrest the murderer?" Detective Lizheng said, "Again."

Who is the murderer

A murder case has been investigated for a long time and remains unsolved.　　

The officer angrily asked the detective, "Now that another person has been killed, when will you arrest the murderer?" ”　　

Detective Lizheng said: "Another person died, indicating that we have another clue, we have enough evidence to prove that the murderer is guilty, but we don't know who the murderer is!" ”