Letter Perfect

Letter Perfect refers to episode 26 of the eighth season of the television series Forensic Files which was broadcast for the first time on February 14, 2005.

Plot summary
A healthy young man, Michael Hunter, dies mysteriously in his sleep. There are no signs of trauma or injury, but toxicology tests reveal a lethal dose of lidocaine in his blood.

Investigators find a suicide note, and presume he killed himself until a forensic linguist examines the note and determines that what the victim said is less important than how he said it.