David T. Matusiewicz

2 appeal cyberstalking convictions that led to life terms

A brother and sister convicted of cyberstalking linked to the killing of the brother's ex-wife had their freedom of speech rights violated, and their trial was tainted by irrelevant evidence, their lawyers argued Wednesday.

David Matusiewicz and Amy Gonzalez were sentenced to life in prison after their father fatally shot Matusiewicz's ex-wife and her friend at a Delaware courthouse in 2013. The killing of Christine Belford capped a three-year campaign of torment and stalking waged by the family against the woman in an effort to regain custody of the three children she had with Matusiewicz, according to prosecutors.

Attorneys for Gonzalez and Matusiewicz told a panel of...