CHICAGO (CBS) – A Cook County judge ruled on Friday that a man convicted decades ago of killing his neighbors, Nancy and Richard Langert, and their unborn child, will not be resentenced.

David Biro of Winnetka was 16-years-old at the time of the crime.

"I'm just hopeful that someday we'll have legal finality," said Nancy Langert's sister Jennifer Bishop-Jenkins. "Because it's been 33 years since their murder and this decision should be the last time I should ever have to come to court,"

Biro's attorney had requested his client be resentenced for the death of the unborn child.

His attorney argued he was a juvenile at the time of the murder and shouldn't have been sentenced to life.