A man whose ex-wife was gunned down by his father at a Delaware courthouse after a bitter custody battle that included international kidnapping is facing sentencing along with his sister on federal cyberstalking charges.
 
David Matusiewicz and Amy Gonzalez were to be sentenced Thursday. Their mother, Lenore Matusiewicz, was sentenced to life in prison last week.

All three were convicted of conspiracy and cyberstalking resulting in the 2013 death of David's ex-wife, Christine Belford. Prosecutors say the cyberstalking convictions were unprecedented.

Thomas Matusiewicz, David's father, fatally shot Belford and a friend as they arrived for a support hearing involving the three daughters Belford had with David.

Thomas Matusiewicz then traded gunfire with police before killing himself. His widow and children have denied knowing that he planned to kill Belford.