Mollie Tibbetts’ Alleged Killer Pleads Not Guilty

Mollie Tibbetts’ Alleged Killer Pleads Not Guilty

Cristhian Rivera, who is accused of killing Iowa college student Mollie Tibbetts, pleaded not guilty to murder charges at his arraignment Wednesday. Tibbetts disappeared in July, launching an investigation that captivated the nation for a month before authorities found her body.