Rocker Kurt Cobain 's officially declared suicide in 1994 is being reviewed by cops in Seattle , Washington, following the emergence of shocking new evidence indicating the Nirvana frontman may have been murdered, RadarOnline.com can reveal.

In a world exclusive, Washington-based private eye Jason Jensen told RadarOnline.com two Seattle cold case detectives and a King County assistant prosecutor secretly began investigating the case after he provided disturbing documentation alleging that a suicide note found at Cobain's death scene could have been forged.

Jensen says a pair of handwriting specialists found the note may have been partially written by another person – and one of the pros believes a so-called practice sheet found long ago in the possession of the Smells

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