But, as CBS News correspondent Sharyn Alfonsi reports, it remains unclear what part Borden may have played in the crime.
Police are now calling Borden a victim, Alfonsi says. She is not under arrest. But they say they're not closing the door on the possibility that she may have had some role in the events that unfolded. Since she is 14 years old, there is also the question of possible statutory rape charges for Ludwig.
Warwick Township Police Chief Richard F. Garipoli Jr. tells CBS News, "Kara's upset, she's crying. She's a 14-year-old child and we seem to forget that. She's devastated."
A prayer service is planned Wednesday night for the slain couple in their hometown.
Monterey Chapel church elder George Landis says "only God knows the purpose" of their deaths. He adds that "Mike and Cathy are in a better place."
Ludwig did not fight efforts to return him to Pennsylvania Tuesday. A Pennsylvania judge ordered him held without bail. He was not represented by a lawyer at the arraignment. A preliminary hearing was set for Nov. 23.
Indiana police captured Ludwig on Monday after the car he was driving slammed into a tree during a chase. He is suspected of shooting Kara's parents, both 50, in their Lititz home early Sunday after an argument over the teens' relationship.
Ludwig and Borden were both home-schooled teenagers from Lititz, a small town in Amish country about an hour west of Philadelphia. Garipoli told The Early Show co-anchor Julie Chen that murder suspect David Ludwig was "being very quiet" Tuesday, and appeared to be in a state of shock.
Police say Ludwig killed Borden's parents, Michael F. and Cathryn Lee Borden, early Sunday after an argument about her curfew when she came home late. The shootings happened at the family's home near Lititz, Pa., about 60 miles west of Philadelphia.
He faces preliminary charges in Indiana of criminal recklessness and resisting law enforcement, authorities said. Police in Pennsylvania issued an arrest warrant on charges of criminal homicide and kidnapping.
Few details were known about the pair's trip. Authorities said they don't know the route they traveled, if they had family or friends in Indiana or if they were simply passing through the state.
The Bordens, both 50, were apparently shot once each in the head, authorities said. Mike Borden worked for a printing company, said neighbor Tod Sherman.