An idiot

Yes, I'm looking for room 345, the one on the window side.

"Are you alone sir?"

"Yes"

"What is your name sir?"

"John Johnson"

The hotel clerk looked at him with suspicion, looking at him, his face looked quite truthful.

"So..John Johnson, and are you expecting any visitors sir?"

"No, only me"

"Thank you sir, here's your keys and booklet, have a nice stay"

The man walked to his room with a briefcase and a luggage bag that wasn't too heavy. He opened the room and took out his luggage and arranged his clothes neatly. Afterwards he laid on the bed for a short nap. He overslept and it was noon, he missed dinner. All places were closed and people were sleeping. He opened his briefcase and pulled out a gun, went out to the hall between the rooms. He had a clothespin and some metal screws, went to room 643 and opened it, no one was there. Disappointing. He didn't want to go to any other room, and it was breakfast time. He went and got a string and taped it to the ceiling, and then attached the string to a clothes hook inside the bathroom. Following, he attached the next end to the TV's wiring, and finally to the trigger of his gun pointing at the main door. After all that endeavor he went out and got breakfast, it was a fruit salad and an omelet, and some coffee. Afterwards he went to check on his contraption, so he opened the door. The TV and its wiring fell to the floor, the clothes on the clothes hook fell onto the wet floor, and the tape came undone. A true tragedy, but the gun looked fine, and the man had a hole on his head.

He is dead now.