A lawsuit filed in 2013 claimed that Texas was secretly experimenting with new drugs in an attempt to keep its executions on schedule.
In response to a motion from Philadelphia's district attorney, the Pennsylvania Supreme Court could overturn the stay and order, putting the execution back on schedule.
The Ohio Department of Rehabilitation and Correction has Phillips scheduled for execution on July 26, one of four scheduled for 2017, and 23 more individuals scheduled through 2020.
Should the judges decide that the execution can be put back on schedule, it is possible that by the end of this week Hill will be faced with his fourth brush with the death chamber in the space of a year.
Nevertheless, Texas appears to have stocked up on about $50,000 worth of execution drugs, enough to stay on schedule for this year, the American-Statesman reported on Thursday.
"State and federal courts will continue to address each scheduled execution on a case-by-case basis".
Gov. Arnold Schwarzenegger met with prosecutors and defense lawyers but issued no decision on commuting the sentence of Stanley Williams, whose scheduled execution on Tuesday has drawn international attention.
A federal appeals court postponed until Sept. 18 the scheduled execution on Wednesday of a convicted killer who has chosen the electric chair over lethal injection to illustrate what he says is the brutality of capital punishment.
The three now on the execution schedule, all Harris County cases, are : Eddie Capetillo, set to die March 30; Efrain Perez, June 23; and Raul Villarreal, June 24.
The state embarked on its execution schedule last week despite criticism from civil rights groups such as Amnesty International that accused Arkansas of "callously rushing the judicial process by treating human beings as though they have a sell-by date".
