DOYLESTOWN, Pa. (AP) — A jail inmate who was the focus of an investigation into the disappearances of four men admitted on Thursday that he killed them, his attorney said in a surprise development.

Cosmo DiNardo, 20, confessed to the commission of or participation in four murders and agreed to plead guilty to four murder counts, attorney Paul Lang said outside court, where DiNardo had met with investigators. DiNardo also told investigators where the bodies are.

"I'm sorry," a shackled DiNardo said as he left the courthouse.

In exchange for the cooperation, Lang said, prosecutors were taking th...