TRENTON  Gov. Jon S. Corzine signed into law a measure repealing New Jersey’s death penalty on Monday, making the state the first in a generation to abolish capital punishment.

Mr. Corzine also issued an order commuting the sentences of the eight men on New Jersey’ death row to life in prison with no possibility of parole, ensuring that they will stay behind bars for the rest of their lives.

In an extended and often passionate speech from his office at the state capitol, Mr. Corzine declared an end to what he called “state-endorsed killing,” and said that New Jersey could serve as a model for other states.

“Today New Jersey is truly evolving,” he said. “I believe society first must determine if its endorsement of violence begets violence, and if violence undermines our commitment to the sanctity of life. To these questions, I answer yes.”