Prosecutors pursuing the death penalty for the Aurora movie theater attack may use recordings of suspect James Holmes taken in the Arapahoe County jail, according to a new court filing Friday.

A list of evidence against Holmes that prosecutors included in the filing says prosecutors may use “[a]ny video and/or audio recording of the defendant and/or any person he interacts with while incarcerated.” The possible existence of such recordings — and the fact that prosecutors believe they may help their case — has not been previously revealed.

Prosecutors filed the document because of a legal requirement that they disclose an overview of the evidence they will use at a death-penalty sentencing hearing.

Much of the potential evidence in Friday’s filing was discussed during Holmes’ preliminary hearing. That includes such things as the explosives and Batman mask found in Holmes’ apartment, photos of Holmes posing with guns police say were used in the attack and details from online dating profiles that prosecutors say Holmes created.

Friday’s filing, though, also revealed new evidence. In addition to jail recordings, prosecutors said they could introduce tracking data obtained for Holmes’ cellphone. Prosecutors might also use “spent shell casings and other evidence” collected at the Byers Canyon Rifle Range in Hot Sulphur Springs, the best indication yet that police believe Holmes used the gun range for target practice.

John Ingold: 303-954-1068, jingold@denverpost.com or twitter.com/john_ingold