A woman who pleaded guilty in the carjacking and murder of an Atlantic City casino patron cried as she apologized for not stopping it.

Jessica Kisby showed a different side in court Thursday. When she testified at her ex-boyfriend's trial last month, Kisby giggled and yawned on the stand.

A judge sentenced Kisby under a plea deal to 30 years without parole for murdering Martin Caballero of North Bergen.

A jury in April convicted the ex-boyfriend, Craig Arno, of the murder. He was sentenced to 120 years in prison, and must serve 102 years before becoming eligible for parole.

The pair cornered the victim in the parking garage of the Trump Taj Mahal in 2010, stabbed him to death and set his new SUV ablaze in an attempt to cover up the crimes.