Dave Grohl just opened up about how "dark" it was for him losing his Nirvana bandmate Kurt Cobain, and how he decided to continue making music anyway. The legendary rocker appeared on The Late Show with Stephen Colbert in early May, where host Stephen Colbert asked Grohl how he knew he was ready to start a new band - i.e., the 31-year-old Foo Fighters - after Nirvana split up following Cobain's untimely death at 27. Kurt Cobain died by suicide at 27 years old. By: Hugo Dixon/Capital Pictures / MEGA "When Nirvana ended, I wasn't sure what to do.