The former girlfriend of Marcus Hurd, the sole survivor of the 2010 Mattapan killings, today contradicted Hurd’s sworn testimony that he identified Dwayne Moore as the shooter while the couple was watching television together.

Tamara Cannon testified in Suffolk Superior Court where Moore’s defense attorney, John Amabile, is asking Superior Court Judge Jeffrey Locke to block Hurd from identifying Moore as the shooter during Moore’s upcoming first-degree murder trial.

Moore is being tried a second time in the murders of Simba Martin, 21; his girlfriend, Eyanna Flonory; her 2-year-old son, Amanihotep Smith; and Martin’s friend, Levaughn Washum-Garrison, who were shot on Sept. 28, 2010. Hurd was shot in the head, but survived and is now a quadriplegic.

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The first trial — during which Hurd testified he could not identify the shooters — resulted in a hung jury for Moore and an acquittal for his co-defendant, Edward Washington, 33.

During three hours of testimony last week, Hurd testified he withheld information from Boston police and also said that he now can recall who his attacker was. He described one incident when his memory improved.

He said that a couple months after the shooting he was watching television with Cannon, who was then his fiancee. When Moore’s face was shown on television, Hurd testified he turned to Cannon and told her that Moore was the person who shot him.

“ ‘Baby, that’s him right there,’ ” Hurd testified telling Cannon. “When someone does something like that to you, if you see that person’s face again, you're going to recognize them.”

But Cannon, 33, disputed her ex-boyfriend’s testimony during questioning by Amabile today.

“Do you have any recollection of him watching TV coverage prompting him to make any identification?” Amabile asked.

“No,” Cannon replied.

“He never pointed to the set saying ‘there’s the man that did this to me,’ did that happen?” Amabile asked.

“No,’’ Cannon replied.

Cannon was on the stand for about five minutes, and was not cross-examined by Edmond Zabin, chief of Suffolk District Attorney Daniel F. Conley’s homicide unit, who is prosecuting Moore.