Caylen Deller is charged with First-Degree Murder with a Firearm and Tampering with Physical Evidence and Failure to Report a Death. She is accused of killing her ex-boyfriend Chad Mullen and burying him in a shallow grave. Deller allegedly shot and killed Mullen at her horse farm and then used a horse to drag the body to a neighboring farm, where Mullen was found buried in a shallow grave more than a month after his disappearance. Deller allegedly told several people that she had killed Mullen because she suspected Mullen had been sexually abusing her then-5-year-old daughter. Investigators found no evidence that the child had been abused, but said that the child’s comments suggested she had witnessed the killing. Investigators say cellphone evidence shows Deller had help from a friend, Tina Lee-Ellis, who is accused of using a skid steer tractor to dig a hole for the victim's body on a property where she worked as a part-time security guard.