The Tupac hologram at Coachella seems to have started the "Return of the Dead".  Although,  several celebrity estates have said they have been working with various companies to ressurect their loved ones for quite some time.

We can look forward to hologram shows from Elvis Presley and now we have learned about the virtual development ofJim Morrison and Jimi Hendrix 

Doors manager Jeff Jampol says "Hopefully, 'Jim Morrison' will be able to walk right up to you, look you in the eye, sing right at you and then turn around and walk away."

Meanwhile, Hendrix's sister, Janie, who heads the company that controls the guitar legend's music and likeness, has been collaborating for around one year with a London-based company and says "For us, of course, it's about keeping Jimi authentically correct"

But why wait till someone's dead?  Bill Murray, who is very much alive and well and clearly still hilarious brought himself along for his Letterman appearance. This is why I love Bill Murray ...