Dr. Richard Brown, a prominent researcher at a well-known biotech lab in the United States, was found murdered in his lab. Richard had been working at this lab for several years, leading important projects. On the day of the incident, Richard was analyzing new experimental results in his lab.

Richard's body was discovered the next morning by his colleague, Sarah Kim, who immediately reported it to the police. The CSI team arrived on the scene and began an investigation, identifying three other lab employees as suspects.

This case is highly complex, and it appears that the experimental results Richard discovered could have posed a threat to someone. The CSI team is closely examining security records, clues, and the testimonies of the suspects to uncover the truth behind the incident.

The CSI team discovered several important clues at the crime scene.

• Security Camera: The security camera captured an individual entering the lab, but the footage is blurry, making it difficult to identify the person. The individual was wearing loose clothing and appeared tall.
• Fingerprints: Multiple fingerprints were found on the lab door handle and the computer mouse. Some fingerprints have yet to be identified.
• Research Data: Some of Dr. Richard Brown's research data is missing, which could have a significant impact on the company's future.
• Victim's Phone: Richard's phone was not found in the lab, and his last call was to John Choi.
• Victim's Watch: Richard's watch was found next to his body, with the glass shattered and the watch stopped. The time indicated on the watch was 10:15 PM.
• Bloodstains: Bloodstains were found on the lab floor and desk, confirmed to be the victim's.
• Glass Shards: Glass shards, believed to be from the victim's watch, were scattered on the lab floor.
• Computer Log: Someone logged into the victim's computer around 9:45 PM and accessed certain files.
• Heavy Object: A heavy object-related injury was found near the victim's head.

These clues will be crucial in contrasting with the suspects' testimonies to reveal the truth of the case.

Sarah Kim is a colleague of Dr. Richard Brown and the person who reported the incident. She claims to have been working late at the lab on the day of the incident and discovered Richard's body when she went to his lab afterward.

Testimony:

• She had been closely collaborating with Dr. Richard Brown recently.
• She met Dr. Brown in the lab around 9:30 PM on the day of the incident.
• She saw Dr. Brown using a heavy tool on his desk.
• She last spoke with Dr. Brown in the lab corridor around 10:00 PM.
• She claims to have been with other colleagues at the time of the incident.

Michael Lee is the head of the lab and had conflicts with Richard regarding their work. He claims to have stayed late at the lab on the day of the incident and last saw Richard in the late afternoon.

Testimony:

• His relationship with Dr. Richard Brown had become strained recently.
• He stayed at the lab after an evening meeting on the day of the incident.
• He did not see Richard when he passed by the lab around 9:45 PM.
• He had a disagreement with Dr. Brown about the direction of their research on the day of the incident.
• He saw Dr. Brown handling lab equipment.

David Moore is the HR manager at the lab and the last person to speak with Richard on the day of the incident. He claims to have had a brief conversation with Richard the day before and was at home resting on the day of the incident.

Testimony:

• He had no personal conflicts with Dr. Richard Brown.
• He spoke with Dr. Brown over the phone on the evening of the incident.
• He felt something was off during his call with Dr. Brown around 9:00 PM.
• He claims to have been at home at the time of the incident.
• He recalls seeing Dr. Brown frequently using a hammer in the lab.

John Choi is the security head at the lab and was responsible for the lab's security on the night of the incident. He claims to have been patrolling the lab perimeter at the time of the incident and did not notice anything unusual.

Testimony:

• He was patrolling the lab's perimeter at the time of the incident.
• He had little personal interaction with Dr. Richard Brown.
• He last saw Dr. Brown in the lab corridor around 9:50 PM.
• He stated that there were no anomalies with the security system during the incident.
• He recalls that one of the tools Dr. Brown frequently used in the lab was a hammer.