One day the local police from the Stack Exchange community received a concerned call from one of the bakeshop owners nearby.
Police: Good Morning, this is S.E. Police. How may I help you?
Bakeshop Employee: Hello sir, I'm an employee in the bakeshop near the police department. I am worried about the house in front of our shop. The owner of this house is one of our best customers, and he asked me to do him a favor. He wanted me to prepare 20 pieces of our specialty bread to be picked up early in the morning. He told me that he would like for his guests to taste our bread. However, it's already the second day since he asked me and I haven't seen him. I am very worried because he always picks up bread from us early in the morning, and he has promised to pick up his order.
Police: okay sir, we will send some officers to the house you are mentioning.
As the police visited the house, they tried to knock, but found that the door was open. They proceeded inside the house.
They entered the house, and tried to find the owner of the house. They found his dead body, hanging from the high ceiling of a well lit room. There were two glass windows and one of them was broken. It seemed as if something was thrown to break the window. The police that responded to the house immediately called the forensics department and started the investigation. The room was empty; there was no furniture, garbage, or any large items inside the room, only shards of broken glass and the dead body of the owner inside, the police also checked out side the the house where the broken window is and found an empty bottle of beer. broken, might be from the fall. there where also no furnitures that looked liked misplaced inside or outside of the house, the house was pretty clean.
The police checked the last contacts of the owner and found out that there were two people that the owner invited for a drink in his home, one girl and one guy. They were brougt in for interrogation, and the police asked them questions regarding the scene and what happened when they visited.
The girl admitted that they three of them had some drinks, and she also admitted that while she was drunk she happened to have a conversational fight with the owner of the house.
Girl: I said to him, "No! We can't be together again." I don't love him anymore, and I had brought my new boyfriend for him to meet and have a drink. I liked him and wanted to still be friends with him, but he still insisted he loved me and I couldn't handle it. I needed it to stop!
Boy: I was there to escort my girlfriend. Although I didn't like what he was doing to my girlfriend, I still tried to understand his feelings. But... it was too much. I had to punch him in the face to protect my girlfriend from him. He is a nuisance and he deserved to die. After the confrontation, me and my girlfriend left the house peacefully and never heard from him again.
The police are very puzzled about this bizarre crime and do not know the answer.
Now, if you can help the investigators.. WHO IS THE KILLER?
Bonus Question: How was the owner Killed?