Massachusetts State Police Trooper Nicholas Guarino reads entries from Brian Walshe's search history in court from the witness stand. Walshe, who denies killing his wife Ana Walshe, pleaded guilty last month to misleading police and improper conveyance of a human body. Her body has not been found.

What is behind the rise in gun related violence in the U.S.

One Night in America: the gun violence epidemic plaguing the U.S.

Worst hitman ever. - The Joe Rosebrook case centers on a long-simmering grudge, a murder-for-hire plot, and a catastrophic case of mistaken identity that went unsolved for nearly a decade. Rosebrook, a small-time Ohio fraudster and chop-shop operator with a habit of retaliating against people he believed had crossed him, sought revenge against a man named Daniel E. Ott- someone he blamed for exposing one of his earlier scams. The murder contract passed through several intermediaries until it rea