"If that's the case, how did the murderer know the victim had returned home and perfectly avoided the surveillance to kill the victim and then vanished from the outside cameras?"
There is only one reason.
"It's because the killer is very familiar with the surroundings here and has a way to bypass the surveillance to enter the villa."
Brian looked down disdainfully at Howard, who was getting up:
"Also, the cause of the victim's death was not from a dagger piercing the heart.
Idiot, didn't you notice that the wound and the victim's back muscles were at a right angle?
It was clearly inserted after the victim was lying on the ground.
There was no blood spatter at the wound location, nor a large amount of blood from the victim's mouth and nose, which indicates that she was already dead before the heart was pierced, and that's why the inactive blood showed little reaction."
"So tell me, how did the murderer avoid the surveillance?"
