I believe Kurt Cobain was a drug addict who suffered from multiple, overlapping behavioral or mood disorders, and was unable to cope with the pressures of celebrity or being in love with a crazy person. Maybe the least shocking suicide this side of Ian Curtis. I also doubt that Courtney Love, who can barely manage the details of her day-to-day existence, would be capable of committing a murder and successfully disguising it as a suicide.
There is almost certainly intelligent life elsewhere in the universe, but it is probably so spatially and temporally distant from us that we will be unable to ever effectively make contact or communicate with it. I would probably just name them the galaxians or something.