George Zinn, who allegedly fabricated a confession in the killing of conservative activist Charlie Kirk, has been arrested on charges of obstruction of justice and possession of child sexual abuse material, Utah authorities said.

Zinn, 71, was arrested at the scene of the September 10 shooting at Utah Valley University in Orem after shouting, “I shot him, now shoot me.” He later told investigators he faked the confession to help the real suspect—later identified as Tyler Robinson—escape, according to a probable cause statement.

Authorities said an investigation into Zinn led to the discovery of explicit material on his phone, including more than 20 images of children between the ages of 5 and 12. Court records also cite graphic messages in which Zinn admitted to being aroused by the material.

According to court documents obtained by TMZ, FBI agents interviewed Zinn at the hospital where he was taken after complaining of chest pain. During that interview, Zinn admitted to viewing child sexual abuse material and said he was “sexually aroused” by children.

Investigators reportedly found images of underage girls in their underwear on his phone.