Nurses vomited on hearing how a patient raped his girlfriend’s 14 year-old daughter before the victim’s mom bought a saw used to dismember her, police say.

The hospital staff have been warned not to tell jurors how they reacted on hearing Jacob Sullivan’s alleged confession during his alleged murder trial.

They told police how Sullivan’s comments on how he allegedly killed Grace Packer sickened them.

Murder victim Grace Packer. Hospital staff are to be barred from telling jurors how they felt after her alleged killer confessed his crime to them at his upcoming trial (Picture: NBCPhilly)

But on Monday it was announced those key witnesses will be barred from telling a court how they felt to avoid swaying the jury against Sullivan, the Morning Call reported.

Grace was adopted by Sullivan’s girlfriend Sara Packer, who is accused of watching as he raped and strangled her in July 2016, before helping cut the teenager’s body up.

Packer, who is also charged with Grace’s murder, is further accused of fantasizing with Sullivan about his attack on Grace before it took place.

Sullivan, of Richmond Township, Pa., allegedly took a Viagra and watched violent ‘rape’ porn to prepare to sexually assault Grace, then threw her in a closet after the attack was finished.

The porn allegation, Viagra and pre-attack fantasy allegations were made by Katherine Allbright – who is said to have been in a polyamorous relationship with Sullivan and Packer.

Jacob Sullivan is said to have confessed killing Grace to jurors, and branded the girl ‘a nightmare’ (Picture: Bucks County Sheriff’s Office)

She told police that ‘in the days leading up to and following the rape and murder of (Grace), Sullivan would stream and watch a pornographic video involving a violent rape.’

The alleged killer, who reportedly told police he was a ‘closeted rapist,’ is said to have killed the youngster after returning the next day to find out she was still alive.

Packer and her ex-husband adopted Grace and the girl’s younger brother in 2007 three years after becoming their foster parents.

After killing the girl, she and Sullivan allegedly packed the girl’s body in cat litter in their attic, before reporting the teenager missing and claiming she had stolen $300.

The couple are then said cut Grace up and scattered her remains across rural countryside in October 2016 after police began to ask questions about her whereabouts.

Grace’s adoptive mother Sara Packer will also stand trial for her murder (Picture: Bucks County Sheriff’s Office)

Grace’s remains were discovered by hunters, with Sullivan and Packer charged after attempting suicide in January 2017.

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It was during Sullivan’s subsequent hospital stay that he allegedly confessed his crime, branding Grace ‘a nightmare’ and claiming that Packer wanted to return her to the care of the state.

The couple will stand trial for the Grace’s murder in January.