BOISE, Idaho (AP) — The Idaho Supreme Court upheld the first-degree murder conviction Monday of a Boise man who killed an 8-year-old boy and reported the child missing.

The Idaho Statesman reports ( 42-year-old Daniel Ehrlick Jr. will continue serving two life sentences despite claims in his appeal that jurors were influenced by the prosecution's ability to call him a liar in court.

Justice Joel Horton wrote the court's decision, which says the prosecutor explained evidence that shows Ehrlick misled the investigation.

Third grader Robert Manwill's body was found floating in a Boise canal in 2009 with extensive injuries to his abdomen and head. More than 2,300 people volunteered for the search, one of the largest in Boise's history.

Manwill's mom and Ehrlick's girlfriend, Melissa Jenkins, was convicted of aiding and abetting the murder.