The 23-year-old Evesham man pleaded guilty to the November 2003 attack on Nancy Clark as she walked near her home in the exclusive Sanctuary development.
"When you approached Mrs. Clark your intention was to sexually assault her, correct?" asked his lawyer, Mike Riley. Kornberger replied, "yes."
Kornberger also admitted repeatedly stabbing Nancy Clark with a 7 or 8 inch serrated knife.
From her home in Evesham, Nancy Clark declined to speak to reporters. But Kornberger's guilty plea may end the possibility of having her testify against him, considered a plus for the defense.
Family members of Kornberger's alleged victims were in court, as were Kornberger's parents. His father, Jim, described what's happening as a "nightmare."
Kornberger's trial for the Evesham murder of 24-year-old Krista DiFrancesco and the attack of another woman in 2003 will begin on Tuesday.
He is currently serving 18 years for trying to rape a Camden County woman.
