Many authorities on the subject (e.g., Patrick Lundborg in 2010. The Acid Archives (2nd ed.). Lysergia. p. 394) assert that the Elevators are the "first" psychedelic rock group. Powell St. John (later of "Mother Earth") and a member of 13th Floor discusses "the life and times" here--> http://www.musicliferadio.com/2010/10/024-sultan-of-psychedelia/.
Regardless, Roky Erikson was a very early casualty (and a sad one, too) of the "War On Drugs".