The result means Wigan are still waiting for their first win at the Halliwell Jones Stadium.
Taxi driver Christopher Halliwell, 47, from Swindon, has been charged with 22-year-old Miss O'Callaghan's murder.
Orton was killed by his partner Kenneth Halliwell in 1967 at the age of 34.
Halliwell's eventual arrest came at an Asda supermarket on the outskirts of the Wiltshire town.
After the case against Halliwell collapsed she said "somebody has made a terrible mistake".
BBC: Becky Godden's father angry at police for arrest mistake
Christopher Halliwell, 48, escaped charges over Ms Godden's death because police ignored arrest guidelines.
BBC: Christopher Halliwell's daughter in plea for murder truth
Christopher Halliwell led police to Becky Godden's body shortly after he confessed to killing Miss O'Callaghan.
Christopher Halliwell led police to her grave but was not prosecuted after detectives ignored arrest guidelines.
Geri Halliwell, for example, a former Spice Girl, found that her solo album flopped.
But Halliwell was not prosecuted over that death after a judge ruled detectives had ignored arrest guidelines.
Mel B and Geri Halliwell have already learned that life alone in the pop world is tough.
Halliwell also led police to the body of Becky Godden shortly after he confessed to killing Miss O'Callaghan.
Halliwell was not taken to a police station to be read his rights by Det Supt Steve Fulcher.
Christopher Halliwell was sentenced to life with a minimum term of 25 years for the murder of Sian O'Callaghan.
In a statement, Halliwell's wife Lisa also said her thoughts were "constantly" with Miss O'Callaghan and Miss Godden's families.
BBC: Christopher Halliwell's daughter in plea for murder truth
Mr Halliwell is due to appear before Bristol Crown Court on 14 July.
Christopher Halliwell, 47, of Ashbury Avenue, Swindon, is accused of killing Miss O'Callaghan.
The public, it turned out, was interested in Ms Halliwell, but preferred looking at her to hearing her sing.
Halliwell's green Toyota Avensis taxi, with posters appealing for help to find Sian pinned in the back, was taken away.
Cerny has made 34 appearances this season and 50 in all since taking over the goalkeeping duties from Bryn Halliwell.
These two players, again, shows our commitment to bringing the best talent in Super League to The Halliwell Jones Stadium.
Becky Godden's remains were discovered after Christopher Halliwell led police, investigating the murder of Sian O'Callaghan, to a field in 2011.
BBC: Becky Godden farmland grave: Narrative verdict recorded
Miss O'Callaghan was abducted by Halliwell after a night out in Swindon and taken to Savernake Forest where he murdered her.
Following his arrest, Halliwell was not taken to a police station to be read his rights by Det Supt Steve Fulcher.
Killer taxi driver Christopher Halliwell has been urged by his daughter to "tell the truth" over the death of Becky Godden.
BBC: Christopher Halliwell's daughter in plea for murder truth
The Noes on the other hand hope that their secret weapon could be Geri Halliwell, the singer and former Spice Girl.
Natasha Halliwell said her father, who is serving a life sentence for the murder of Sian O'Callaghan, should "do the right thing".
BBC: Christopher Halliwell's daughter in plea for murder truth
Halliwell, 48, admitted to a senior detective that he murdered Miss O'Callaghan and Miss Godden, and even led officers to their bodies.
BBC: Christopher Halliwell's daughter in plea for murder truth
Halliwell confessed he had moved Sian's body, before the police had started following him, to a remote spot, close to Uffington in Oxfordshire.
Since the case, Wiltshire Police has apologised to Ms Godden's family while Halliwell's daughter has appealed to him to tell the family what happened.
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