Sam and Dean are in college, Dean was studying mechanics, Sam was studying Law. Dean was always interested in mechanics, fixing cars, building engines for cars.
Sam was studying law, he wanted to help others who haven't been served justice, help those get out of bad relationships or help those who have been mistreated by employers, con artists and many other horrible people.
Dean was building an engine for a pickup truck, Dean found every piece for the engine, he built like a jigsaw puzzle.
Sam was doing an essay on a case that is happening in town. The case is about a murderer who was killing people then taking car parts. Sam was reading the article and he was getting confused about this. A kidnapping, then murder, then robbery.
That night, Sam asked Dean where he got the parts for the cars he was building, Dean said that there's an order form mechanics use to get parts to fix cars whether it'd be for the headlights, taillights, cooling for the AC in the car or heating for the inside of the car.
Sam started investigating more about the latest missing people and people who reported parts for their cars being stolen after a kidnapping or murder. Sam read and read, Dean would always be out at the times of the kidnappings or murders. Sam didn't want to think that his own brother was capable of it.
As Sam did his essay, people at school wanted Dean to be kicked out. Dean showed up covered in blood, Dean said he got into a fight, but he had no bruises, cuts on his face.
The police showed up, Sam was shocked to see his brother get arrested. As Dean was being handcuffed, Dean kept yelling that he was innocent. Nobody believed him. Dean then looked at Sam, he wanted his brother to believe him. Sam he didn't know what to think, he looked away from Dean as Dean taken away in the police cruiser.
A few months after Dean's arrest, he was convicted of kidnapping, murder and robbery. Dean pleaded not guilty to the charges against him, then he went to trial.
Sam, John and Mary didn't know how to feel, they apologized to the families of those who Dean killed, they knew nothing would bring their loved ones back.
As the judge had said they would continue the trial the next day, Dean was taken away with the bailiff.
When Dean arrived to his cell, he stole some cyanide pills, he wrote a letter saying where the bodies were, the equipment he used and maps of where the murders happened.
That night Dean took the cyanide pills, he then died in his sleep.
The next morning came, the cops went to wake Dean up, they removed the blankets from over his head, there was Dean's dead body, in his hand was the letter.
When everyone was arriving to the courthouse, the police had handed the judge Dean's letter, the judge then read the letter out loud to the victim's families, Mary felt her heartbreak as the police went to her, John and Sam and told them that Dean had killed himself in his cell.
Sam was shocked because his brother was responsible for murdering innocent people but at the same time, he had taken his own life.
When Dean was younger Mary and John got Dean tested. Dean had traits of a sociopath and psychopath. Dean would harm animals such as squirrels, mice, birds (if he was lucky to catch them).
Mary and John were terrified of their own child, after Sam was born, Dean left Sam in the bathtub, but not too long that Sam almost drowned, Sam was crying because he didn't know what was happening.
Mary and John never told Sam that because he would've been angry at them for keeping that secret or scared of his own brother.
Dean also tried to kill Mary and John, he would stand over them holding a knife or a gun in his hand.
Mary and John were relieved that Dean was dead but at the same time they were heartbroken because their son was dead. John went to the victim's families. He gave his condolences because he knew what his own son did.
The families could see John and Mary felt guilty but they knew it wasn't their fault, how would they know that their own kid was capable of murder?

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SPN Theories
FantasySupernatural is a popular tv show about two brothers Dean and Sam Winchester who hunt the supernatural because of their mother Mary WInchester nee Campbell. When Sam was only 6 months old, a monster named Azael aka Yellow Eyes was giving Sam his blo...