Kurt Cobain/Instagram The case surrounding the death of former rock sensation and Nirvana lead singer Kurt Cobain is now being challenged. According to multiple news reports, new forensic investigators believe that Cobain's death, ruled a suicide in 1994, may actually have been a murder staged to look like a suicide. The 27-year-old guitarist was found dead in his greenhouse with what Seattle authorities determined to be a self-inflicted gunshot wound to the head. Independe