Kathleen Dorsett, former N.J. teacher, and her parents plead guilty in ex-husband's 2010 murder case

(CBS/AP) FREEHOLD, N.J. - Kathleen Dorsett, a former third-grade teacher, and her parents have pleaded guilty in New Jersey to their roles in the murder of Kathleen's ex-husband because they were angry about the divorce decree.

Dorsett told a judge Thursday she sent 42-year-old Stephen Moore to his death in the backyard. This is where her father, Thomas, was waiting to kill him, in 2010.

The father admitted he started an argument with his former son-in-law, then struck him in the head with a cable. Thomas and Kathleen then stuffed Moore's body into the trunk of a car, which was later burned.

Lesley Dorsett, Kathleen's mother, pleaded guilty to conspiracy to commit murder, admitting she plotted to kill her daughter's former mother-in-law to keep her from testifying.

The family members say they were upset they were ordered to support Moore financially.