After Dai Dongjie finished speaking, he walked out with Shen Xinyun. According to the departmental floor plan of the stairwell, they found the marketing department on the fourth floor.

"If the canteen registration record is true, then Li Yuannan doesn't have the time to commit the crime?" Shen Xinyun twisted his eyebrows, as if he was sure and as if he was asking.

"Let's go ask first, and then let's talk!" Dai Dongjie suggested.

The two soon arrived at the marketing department.

The whole marketing department is deserted. They turned back to the third floor and asked, only to find out that the entire marketing department had gone to Thailand for a week.

They left on Friday afternoon, the day before Shen Xinyun and Songhe's people had dinner, on March 7, unless someone turned back.

Otherwise, it is simply impossible to commit a crime.

Now the only hope falls on Yang Xiaotian's line.

On Wednesday afternoon, at one o'clock in the afternoon of March 12, Dai Dongjie and Shen Xinyun drove to Aoqi Electric Co., Ltd.

When they arrived in Och, it was their company's lunch break.

Because Director Zhang was in a hurry, the two of them didn't have too many clues now, and Dai Dongjie was in a hurry to solve the case, so he couldn't take care of it so much and investigated directly.

After asking a few people, they learned that Yang Xiaotian was in the staff dormitory, and the two went straight to the 305 dormitory where he lived, knocked on the door twice, and no one responded. Dai Dongjie's rough voice sounded outside the door: "Is there anyone inside?" ”

A man in his forties, fat and strong, opened the door quickly, and when he saw Dai Dongjie, who was dressed in civilian clothes and had a good appearance, he shouted in annoyance: "Who! At noon, let people not rest. ”

Dai Dongjie took out his police officer ID and said, "Is Yang Xiaotian in this dormitory?" ”

Seeing that it was a policeman, the man nodded politely and shouted inside: "Xiao Yang, someone is looking for you." ”

The two of them entered the house and found that the dormitory of about 20 square meters had three bunk beds and six beds, the space was small and chaotic, and there was a strange smell mixed with different masculinities.

On the other side of the door is a large balcony, probably because of the third floor, so the balcony is not enclosed in the company wall.

Yang Xiaotian was already rubbing his eyes when he heard someone shouting his name.

He saw Shen Xinyun and asked, "You're not the one... Who? Oh, he honestly molded the mold, sorry, I can't name it, we met on Saturday. ”

Shen Xinyun replied: "I'm Shen Xinyun of the Hangdong City Police Station, this is our captain Officer Dai, and I came here today to ask you something." ”

"Hmm."

"Where were you the night before yesterday? Do? Who can testify for you? Shen Xinyun asked three questions in a row.

Yang Xiaotian's return was also very smooth.

"I played CS with my roommates the night before yesterday, and I basically played all night, what's wrong?" Yang Xiaotian yawned a little sleepily and replied.

Dai Dongjie went around for a week and asked, "Are these just a few roommates?" ”

"That's right, there are five of us living here, from five different departments." As he spoke, he introduced them in turn.

"The structure department, the electronic control department, the quality department, the manufacturing department, I am from the process department."

Lu Dacheng of the electronic control department said: "Our 'Aoqi' team can't play CS on the weekend and two nights, and we don't have a bottom in our hearts without him as a sniper." ”

Shang Yuanneng of the structure group also said: "From Monday to Friday, Yang Gong has to go to the Internet café to work part-time as a network administrator, and he only has time on weekend evenings. Then we can still let him go, but we can't let him go if we catch it, hehe. ”

Shen Xinyun looked curiously at the people who enthusiastically took the initiative to testify for Yang Xiaotian, and thought to himself, this guy looks a little muna, and his popularity is quite good.

Dai Dongjie asked: "Yang Xiaotian, are you still working part-time?" ”

Shen Xinyun thought, Yang Xiaotian is Jing Yuan in the morning and evening, it is indeed not worth it to work so hard, no wonder this man is aggrieved and sad when eating barbecue, if this is the case, he has no time to commit the crime at all!

"There's no way, the salary is not high and I want to buy a house, and I can earn an extra point if I find a part-time job. Officer Shen, what are you looking for me for? ”

Yang Xiaotian's expression changed from helplessness to doubt.

Dai Dongjie felt that Yang Xiaotian didn't seem to be suspicious and replied: "It's nothing, routine household checks, just ask." ”

Yang Xiaotian scratched his head innocently: "Oh, in this way, no matter what, I will fully cooperate with you." ”

Shen Xinyun saw Dai Dongjie turn around, knew that he was leaving, and said to Yang Xiaotian and his roommates who were watching the excitement: "Excuse me, you can rest, let's go first." ”

"No need to rest, go to work!" Someone shouted, and everyone got out of bed.

Leaving Yang Xiaotian's dormitory, Dai Dongjie and Shen Xinyun called the surveillance video of the dormitory of Aoqi Company again.

They found that Yang Xiaotian said that no one was in and out, and on the weekend, he did play CS with his roommate in the dormitory.

That night, after investigation, Jing Yuan, Li Yuannan, and Yang Xiaotian all had alibi.

Neither alone nor two of them are combined.

At this point, the case has reached a dead end.

At two o'clock in the afternoon on Tuesday, April 20, Dai Dongjie and Shen Xinyun were at a loss at the police station, and another morning passed, but there was still no progress in the case.

The two of them had a blank mind and couldn't find any breakthrough.

At this moment, Director Zhang hurriedly walked in and shouted, "Captain Dai, another deceased person has appeared." ”

"Is it related to Wang Zixiong's case?" Dai Dongjie asked in surprise.

"I don't think it's anything to do with it, and this time the victim is Li Yuannan from the R&D Department of Songhe Electric."

"Huh?"

Shen Xinyun was shocked.

The two immediately went downstairs to get into the car and quickly drove to Songhe Home Appliances.

When they arrived at the R&D department, they saw all the engineers huddled outside the door, which was covered with thick lines of chalk.

Because of the need to protect the scene, the police did not let them in. but

They were very curious, and they looked at it and talked in a whisper.

"Captain Dai is here."

Forensic doctor Bai Shengxue shouted, and those engineers turned around and saw that there were policemen going in, and immediately took the initiative to give way to a passage, which was very familiar.

"Have you checked it? Death? Time? Dai Dongjie asked after a round.

Bai Shengxue nodded and smiled: "Poisoned to death, killed on the spot, someone should have put poison into the cup of coffee he drank." ”

Through inquiry, Dai Dongjie learned that Li Yuannan had a fixed habit, that is, to make a cup of coffee before lunch and rest in the dormitory after lunch.

Before going to work in the afternoon, drink all the cold coffee.

This habit of his, which has been maintained for many years, is known to almost everyone in the R&D department!

After Dai Dongjie confirmed, he looked around again and asked, "Isn't there a camera in the office?" ”

"No, there is only one in the R&D front desk, that is, Jingyuan's house." Yin Changchun, a structural engineer, replied.

"I'll take you to the monitoring center to adjust the video data."

Yin Changchun took Dai Dongjie and Shen Xinyun to the monitoring hall, and instructed the staff of the information center to call up the surveillance video of the R&D department.