DARDENNE PRAIRIE, Mo., Nov. 21 — Megan Meier died believing that somewhere in this world lived a boy named Josh Evans who hated her. He was 16, owned a pet snake, and she thought he was the cutest boyfriend she ever had.

Josh contacted Megan through her page on MySpace.com, the social networking Web site, said Megan’s mother, Tina Meier. They flirted for weeks, but only online — Josh said his family had no phone. On Oct. 15, 2006, Josh suddenly turned mean. He called Megan names, and later they traded insults for an hour.

The next day, in his final message, said Megan’s father, Ron Meier, Josh wrote, “The world would be a better place without you.”

Sobbing, Megan ran into her bedroom closet. Her mother found her there, hanging from a belt. She was 13.