Quan Jue got the police to take photos of the cigarette butt. After collecting the evidence, he looked up.

There were a total of six floors in the opposite building. Only the windows on the fourth floor were open. Although the lights were turned on, no one stood at the window.

Meanwhile, the lights in the other apartments were turned on and the residents were peering out of the windows in curiosity.

When they saw Quan Jue looking over, the residents quickly ducked, not daring to look anymore.

“Collect the cigarette butt and do a DNA test. Perhaps we can find an eyewitness this time.” Quan Jue retracted his gaze and strode towards Chi Jiao.

“Officer Huo, who lives on the fourth floor of this building?” Quan Jue asked.

Huo Chen immediately looked down at the information and answered, “It’s a man called Jiang Dashan. He’s 42 years old and lives alone.”

“Does he smoke?” Quan Jue asked.

His question caught Huo Chen off guard. He looked at the information and shook his head. “It’s not shown in the information. However, I can help you ask around.”

“There’s no need to ask, I know! Jiang Dashan is a hardcore smoker. He smokes at least two packs a day.” A middle-aged man in a security guard uniform suddenly stuck his head out and interrupted.

Everyone immediately looked at the middle-aged man as they sized him up.

“Uncle, are you the security guard here?” Chi Jiao asked the middle-aged man with a smile.

The middle-aged man nodded. “That’s right. I was the one who discovered this corpse first. How pitiful. A beautiful young lady died just like that.”

“Uncle, did you see the murderer when you found the corpse?” Huo Chen asked.

The security guard shook his head and said apologetically, “I didn’t see the murderer. I was scared out of my wits and quickly went to get someone.”

After the security guard finished speaking, everyone looked a little depressed.

The security guard cleared his throat and continued, “Although I didn’t see him, Jiang Dashan should have seen him. When I came over, I happened to see him standing at the window. From his angle, he should be able to see everything.”

“I found a cigarette butt not far from Cao Mei’s corpse. If I’m not wrong, it should have been left behind by Jiang Dashan,” Quan Jue added.

“In that case, we have our first witness.” Di Ziyan was very excited. He smiled happily. “This is good news. Does Jiang Dashan live on the fourth floor? I’ll go up and find him now.”

“I’ll go with you.” With that, Huo Chen and Di Ziyan walked around Cao Mei’s corpse and headed upstairs.

“Have you finished collecting evidence from the corpse? What was the cause of death?” Chi Jiao looked at Huo Chen’s subordinate, Xiao Liu.

Xiao Liu wanted to vomit from the strong smell of blood at the scene. Fighting back his nausea, he said, “The cause of death is the removal of the heart. The modus operandi was similar to the previous case. However, the murderer’s actions this time were more barbaric. The laceration on Cao Mei’s chest is very crude…”

“I also saw a wound on Cao Mei’s arm. What kind of wound is that?” Chi Jiao had examined the wound just now. She knew how bad it was.