New Trainee Detective

New York, 26 Federal Plaza, Manhattan, Jacob Federal Office Building, 9 am.
Floors 23-26 are the exclusive headquarters of the FBI New York Branch.
In a small conference room.
In the corner behind the conference table, Luo An sat on a chair, raised his hand to look at his straight suit, then looked at the golden badge on his chest, his face wooden.
Bang——
The door of the conference room was pushed open, and a middle-aged white man with a Mediterranean hairstyle and a suit walked in with a folder in his hand. He glanced around and saw that there were no fewer people. Without any nonsense, he said straight to the point: "Attention, this is a park shooting case."
The Mediterranean opened the folder, threw a bunch of photos on the conference table and introduced:
"The victim is McRobert, 43 years old, shot and killed on the path of Central Park at 11:34 pm on April 11, 2005"
After listening to the summary of the case, the trainee detectives on both sides of the conference table went to take photos of the conference table. Luo An was motionless, sorting out the paste-like memories in his mind.
The old killer raised Luo An just to let Luo An avenge blood. As a result, when the old killer died and Luo An successfully went out to find his enemy, he found out that his enemy had been arrested by local law enforcement and sentenced to death by the court.
The enemy was alone and had no relatives, so Luo An did not dare to confront the prison head-on. After thinking for a few seconds, he turned around and boarded the plane to the island country, ready to experience the local customs first, and then open a milk tea shop to spend the rest of his life.
It is impossible to be a killer, and it is impossible to do it in this life. Not only is the risk factor high, but the money comes slowly. How can you make money by opening a milk tea shop in an island country!
"Sir, there is one thing I don't understand."
After Mediterranean briefly introduced the case, Fisher, a white young man with short brown hair and thin lips, tilted his head and asked:
"Why did you hand this case over to us?"
For ordinary murders, there is no need to mobilize the FBI, the New York Police Department can handle it by itself.
"This special hate crime case is the test of the next stage. You 20 new trainee detectives must solve the case and catch the murderer within three days. Senior detectives will give you corresponding scores based on your performance. Those with high scores can be transferred to formal detectives first, and those with low scores will continue to work hard." After saying that, Mediterranean did not organize the folders and turned to leave the meeting room. The moment the door of the meeting room was closed, there was a rumble in the meeting room, and many new trainee detectives leaned over to check the photos and clues. "What are the 'pests' on the ground next to the body of the deceased targeting? Are they black people or reporters?" "It's possible that they are both." "Maybe they are more like reporters. After all, the victims came back from the war zone, where there are a lot of religious fanatics. What they do is not surprising." "Not necessarily. The victims also reported many corruption issues of congressmen." "He really has enemies everywhere"