Federal prosecutors are investigating the activities of a man who killed his former daughter-in-law and another woman at a Delaware courthouse last month before taking his own life.
Relatives of Thomas Matusiewicz (muh-TOO'-suh-wits) testified before a federal grand jury last week. Prosecutors are seeking to revoke the probation of his son, David Matusiewicz, on federal fraud and kidnapping charges for abducting his three daughters.
Thomas Kula, the brother-in-law of Thomas Matusiewicz, told The Associated Press that prosecutors seem to want to prove that, in traveling from Texas to Delaware with his father, David Matusiewicz knowingly violated a prohibition from being around guns.
David Matusiewicz pleaded guilty in 2009 to fleeing to Nicaragua in a motor home with his daughters amid a custody dispute. He was released from prison last year.