บท 527: Chapter 485: Still a Young Man upon Return

In the following days, Changyang City's Image Reconnaissance Brigade and the technical investigation team both got involved in the case investigation.

The residential district where Wang Xingzhai lived was still in a bustling part of the city, and there were a very large number of cameras, including those inside building elevators.

However, the killer kept his head down the whole time and wore a big mask, which greatly hindered the performance of image investigation. Some European countries had a ban on masks for a while, precisely to avoid the difficulty in image recognition.

Jiang Yuan also helped look at the gait; he managed to remember the gait, but when trying to match the gait to the person, if it was in real-time it would have been manageable, but with so many days having elapsed, tracking became difficult.