[Investigation Team] Haunted House Adventure Murder Case

Detective Jack and his girlfriend Luzi, along with his assistant Amin, went to work in the small town of X. On the way, they passed through a forest and saw that it was getting late, so they decided to stay at a small inn. At the inn, they met Little A, Little B, and Little C. Little A suggested that everyone draw lots to take turns exploring the nearby haunted house, and everyone agreed. Little A said, 'I will put 6 small balls in a tube and place it in a room on the second floor of the haunted house. Then you will each take a ball to show that you have been there.' So, the drawing started. After making the lots, Little A said, 'Guests, please draw first.' Jack went first: 'Ah, I am number 2, Luzi is number 4, Amin is number 1,' then it was Little C's turn, then Little A and Little B. As a result, the order to visit the haunted house was Amin, Jack, Little C, Luzi, Little A, and Little B. Everyone managed to get a ball, but after waiting for a long time, Little B, who went last, did not return. So, they all went to the haunted house together and found that Little B was not there, but the balls in the tube were gone, which meant he had already taken a ball. The group thought Little B might have gone back to the inn, so they returned together to wait for him. When they didn't see him for a long time, everyone went to sleep individually. The next morning, the innkeeper found Little B dead in the forest not far from the inn. The cause of death was a heart attack. Jack decided to check the haunted house again and discovered that opposite the room where the tube was on the second floor, there was another room. When he opened the door, there was nothing, it was empty. Jack pondered for a while and then told everyone, 'Actually, Little B was murdered, and the murderer is you! Some special method was used to commit the murder!' Who is the murderer? What method was used to murder him? The answer will be revealed tonight.