Anchorage Police Department says they arrested 18-year-old Denali Brehmer on Friday for the murder of 19-year-old Cynthia Hoffman near Thunderbird Falls. 

According to court documents, Brehmer told police she was with 16-year-old Kayden McIntosh and Hoffman when the victim was killed on Sunday. APD says Brehmer told police the three teenagers were playing around in the woods, agreed to duct tape each other and take photographs.

Police say Brehmer told APD that Hoffman was bound by her ankles and wrists, and had duct tape over her mouth. Brehmer said Hoffman began to panic after she was bound. Court documents say Brehmer told police she was carrying a pistol during the altercation and McIntosh took it from her. He then shot Hoffman in the back of the head. 

Charging documents for McIntosh say Brehmer told detectives she believes Hoffman tried to call the police and that she saw McIntosh push Hoffman into the creek.

Brehmer told detectives she and McIntosh went back to her vehicle in the parking lot. McIntosh then told Brehmer to text Hoffman's sister saying she had dropped off Hoffman somewhere. Brehmer told APD she followed McIntosh's directions because she was afraid of him. 

Brehmer and McIntosh drove back to Anchorage and burned Cynthia Hoffman's belongings along with the gun used to kill her, court documents say.

Kayden McIntosh and Denali Brehmer face charges of first-degree murder and evidence tampering.