CONCORD, N.H. (AP) — A New Hampshire judge has ruled that several documents can remain sealed in a lawsuit that aims to prevent a Vermont man from inheriting money from the millionaire grandfather the family says he killed.

The order was issued Friday in connection with a July lawsuit accusing Nathan Carman of being responsible for the 2013 death of John Chakalos.

The family argued unsealing certain documents would impede the investigation into Nathan Carmen.

They also allege Carman killed his mother, Linda Carman. Nathan Carman has denied any wrongdoing. He's never been charged.

Linda Carman is presumed dead after the boat she and her son were on sank last year. Her sisters have asked a judge to block Nathan Carman from collecting his grandfather's estate money.

The next hearing is May 21.