Ryan Al Najjar drowned after family taped her ankles, hands behind back, and mouth. Father's DNA on tape proves he bound her. Father's DNA under her fingernails shows she fought back. Brother Mohamed's fingerprint on phone case in her shoe. Family chats demand punishment for her Western behavior causing loss of face. Brother tells father twelve days prior she must be punished if lying. Mother writes Ryan deserves death as family disgrace. Family hopes she returns in a box or dead from bullet and poison. Brothers Mohamed and Muhanad charged with father for murder. Father fled to Syria. Prosecutors confirm honor killing motive.