Transcript for Dead Teen's Best Friend Charged With His Murder
Turning now to the story of two teenagers so close people said they were like brothers. Then one of them was killed, buried alive in fact, now two years later, officials have charged his best friend with murder. Reporter: This morning, 21-year-old thomas, seen here in a high school photo sits behind bars accused of murdering his own best friend. Underhill's death shocked a quiet long island community. The graduating senior disappeared that november. Days later, police found his beaten body in a marsh behind an elementary school. The case went cold. Because of evidence basically. Reporter: Police say that he turned himself in just days ago when he learned he would be indicted. But a former class mate said that he could not have killed underhill. They were extremely close. They were inseparable. They always laughed together. Reporter: Investigators suspected murder from the beginning. Because underhill's body was found covered with a woodboard, two sticks lodged in his mouth. This murder is -- has a lot to do with passion and rage. Two key components to this. It's highly personal. And it's overkill. Reporter: Mysteriously, underhill left this year book message. To all my friends I'm so glad for the times we had together. To everyone else, I hate you all. Police haven't released a motive or many details. But the defense attorney said in a statement, thomas liming didn't commit a crime. For "good morning america," gio benitez, abc news, new york.
This transcript has been automatically generated and may not be 100% accurate.