Jurors deliberating for less than an hour convicted a suburban Chicago computer specialist of murder Thursday in the deaths of his wife and three school-aged kids.... Christopher Vaughn, 37, showed no emotion as the verdict was read. Prosecutors said Vaughn pulled the family SUV off the highway after 5 a.m. on June 14, 2007, placed a pistol under his 34-year-old wife Kimberly's chin and fired. They say he then meticulously shot 12-year-old Abigayle, 11-year-old Cassandra and 8-year-old Blake—each in the chest and head. Abigayle was found holding a stuffed animal and a Harry Potter book. Forensics experts said the trajectory of the bullet into Blake's chest indicated he had raised his arm up as Vaughn shot him. Vaughn had awoken his wife and children that morning promising a surprise trip to a water park.