This image provided by the Orangeburg-Calhoun Regional Detention Center shows Justin Bernard Singleton, 19, of Charleston, who is charged with murder in the death of university student Brandon Robinson. Uncredited/AP hide caption

itoggle caption Uncredited/AP

Arapahoe County Sheriff Grayson Robinson holds a picture of Claire Davis, 17, at a briefing at Arapahoe High School in Centennial, Colo., the day after the Dec. 13 shooting. Davis died Saturday. Ed Andrieski/AP hide caption

itoggle caption Ed Andrieski/AP

Senior Jenni Meyers, center, is hugged by her sister Mary as they leave a church with their mother Julie after they were reunited after a shooting at nearby Arapahoe High School in Centennial, Colo. Brennan Linsley/AP hide caption

itoggle caption Brennan Linsley/AP

Laterrica Luther holds the hand of her 6-year-old nephew, Jaden Culpepper, as students from the Ronald E. McNair Discovery Learning Academy arrive on buses to waiting loved ones in a Walmart parking lot in Decatur, Ga., on Tuesday. A gunman had entered the students' school earlier in the day. No one was hurt. David Goldman/AP hide caption

itoggle caption David Goldman/AP

Dec. 18, 2012: Crime scene tape stretches across the property outside the home where Adam Lanza lived with his mother, Nancy Lanza. Inside, police found weapons and other evidence. Lucas Jackson /Reuters /Landov hide caption

itoggle caption Lucas Jackson /Reuters /Landov

Neil Heslin brought a framed photo of himself and his son Jesse (when the boy was an infant) to Monday's hearing in Hartford, Conn. The 6-year-old was killed at Sandy Hook Elementary School in December's shooting. Cloe Poisson/Hartford Courant /MCT /Landov hide caption

itoggle caption Cloe Poisson/Hartford Courant /MCT /Landov