Washington Killer Challenges Death Penalty:   A convicted murderer on Washington's death row is asking the State Supreme Court to overturn his death sentence and find the state's death penalty unconstitutional.  Austin Jenkins of the Northwest News Network reports that, armed with a 2014 report from the University of Washington, attorneys for Allen Gregory argue that Washington jurors are more that 4 times more likely to sentence a black murderer to death than a white murderer. The validity of the report has been the subject of vigorous debate since it was released.  Matt Driscoll of Seattle Weekly reports on the reason Gregory is on death row.  On July 27, 1996, a friend found  47--year-old bartender Genie Harshfield's nude body lying face down,  with her hands tied behind her back.  She had been raped, beaten and stabbed three times in the back and her throat was slit.  DNA evidence tied Gregory to the murder.  In 2000, Gregory was also convicted of the forcible rape of a teenaged girl.  The victim identified Gregory, memorized his license number, and Gregory's DNA matched samples recovered on the victim.  That conviction was overturned in 2006 for trial errors unrelated to his guilt.