Murder weapons in Great Wolf Lodge family massacre may offer premeditation evidence: private investigator

New details point to a possible premeditated plot in the family murders at Great Wolf Lodge in Pennsylvania, a private investigator says.

Metallica Rose Harrison, 27, is facing two counts of criminal homicide after prosecutors say she stabbed and killed her husband, Charles "Chaz," and the couple's 3-year-old son, Tristan. It happened at the resort in the Poconos region of Pennsylvania.

According to a criminal complaint, knives recovered by investigators on scene did not match knives belonging to the resort.