A spokesperson from the company that ran the home told local newspaper Borås Tidning that the extra help had not yet started his new job when the boy attacked the woman.
"The staff member just hadn't yet begun working. But we had hired him, and he was about to begin," said Staffan Alexandersson, spokesman for HVB Living Nordic which runs the accomodation, in an interview with the newspaper.
Alexandersson also told the newspaper that the youth home had contacted a child psychiatrist about the boy, but he would not say when. The boy had only stayed at the home a short time before the attack.
On Thursday the district court was set to decide whether he would be arrested. After the attack, the female staff member was brought to hospital with life threatening injuries, but could not be saved, news agency TT reports. The boy faces charges of murder and attempted murder.