WYCKOFF, N.J. (AP) _ A young man who pleaded guilty along with his high school sweetheart to killing their newborn son at a Delaware motel was released from prison Tuesday after serving 1 1/2 years for manslaughter.

Brian Peterson, 21, had been sentenced to two years but was let out early because of time served before his guilty plea and good behavior.

He walked out of a Price's Corner, Del., prison with his arm around his mother and was taken home by his parents.

In a typewritten statement, Peterson said he was sorry ``for my part in the tragic events that occurred three years ago'' and was happy to be going home.

Prosecutors said Peterson and Amy Grossberg tried to conceal her pregnancy and the birth and then killed their son at a Newark, Del., motel in 1996.

The baby's body was found wrapped in a plastic bag in a trash bin in the parking lot. The couple, both 18 at the time, had said they believed the child was stillborn when Peterson placed it there. But the medical examiner's office said the boy died of skull fractures.

Ms. Grossberg was sentenced to 2 1/2 years in prison. She is expected to be released in May after serving nearly two years.

Ms. Grossberg was a student at the University of Delaware at the time of the crime. Peterson was attending Gettysburg College in Pennsyvania.