Essence Reasoning questions-"Affair Investigation"

In the living room, the visiting rich man George begged private detective Parker, hoping that he could help him investigate whether his wife was having an affair.
Pike was tired of this kind of thing, but couldn't help George's pleading and had to agree to give it a try.
"Do you have any suspicion in your mind?" "Yes, a painter named Tres!" George replied.
"If there is, why ask me to investigate?"
"Because there is no evidence!" George pounded the table hard.






































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"I am usually busy at work, and she said she wanted to learn painting, so I sent her to learn painting from this painter!"
"Tres is where he is today only because of my help. I didn't expect him to be ungrateful!"
"Has your wife ever disclosed to you what happened between them?"
"No, she didn't say anything, so I have to prove the fact." "Where is the place where I learned to paint?" "My wife must be there in the Times Building on the west side." Then, Pike made a detailed investigation of Tres. He has a deep knowledge of painting and is still unmarried. However, he has a romantic temperament and has complicated relationships with many women, and he has made many enemies because of this.
Pike sneaked into Tres's apartment while he was out and carefully installed a bug. It happened that no one was living in the next room, so Pike rented it for the convenience of bugging. Of course, all these expenses were borne by George. During the eavesdropping, Pike learned that there was a man named Skoll who often had conflicts with him. It turned out that it was about winning prizes for paintings, which almost caused bloodshed. Pike recorded their conversations.
Regarding the conversation between Tres and George's wife, Pike listened carefully. It turns out that they do have an intimate relationship, but Tres doesn't really love her. Pike played the recording to George, and he was so angry that he flew into a rage! Another month later, Tres was assassinated in the night. Parker's tape recorder was not turned on at the time, so nothing was recorded.
The police believe that the person who was able to enter Tres' house must be an acquaintance, so George, George's wife, and Skoll are all suspects. But George's lighter was found next to the body, so the police determined that the murderer was George! "The murderer was not him!" Pike refuted this inference.
Excuse me, have you guessed who the real murderer is?