On October 4, 1970, producer Paul A. Rothchild became concerned when Joplin failed to show up at Sunset Sound Recorders for a recording session. Full Tilt Boogie's road manager, John Cooke, drove to the hotel Janis was staying at (Landmark Motor Hotel in West Hollywood). He saw Joplin's psychedelically painted Porsche 356C Cabriolet in the parking lot. Upon entering Joplin's room, (room 105), he found her dead on the floor beside her bed.
Now called the Highland Gardens Hotel:
http://www.highlandgardenshotel.com/history.htm