The man who killed 6-year-old JonBenet Ramsey committed suicide just weeks after the murder, The ENQUIRER has learned exclusively.

Michael Helgoth, a 26-year-old junkyard worker, shot himself to death in Boulder, Colo., on Valentine’s Day 1997 — after telling a friend he was involved in JonBenet’s death.

The issue that goes on sale Friday reveals why a stun gun and a pair of boots are key clues in the case, describes the chilling videotapes found in Helgoth’s apartment, features never-before-seen crime scene photos … and much more.