(Reuters) - A Virginia inmate was executed on Wednesday for murdering two young sisters during a 2006 killing spree, after the Supreme Court denied a stay request despite his argument that the use of compounded lethal drugs violated his constitutional rights.

Ricky Gray, 39, died by lethal injection at 9:42 p.m. local time at the Greensville Correctional Center, Virginia Department of Corrections spokeswoman Lisa Kinney said in an emailed statement

(Reporting by Curtis Skinner in San Francisco; Editing by Shri Navaratnam)