APNewsBreak: Authorities have video of murder suspect killing detective inside Miss. police HQ

This 2008 image provided by the Jackson, Miss. Police shows Detective Eric Smith. Authorities say a murder suspect shot Smith inside the Jackson police headquarters and that both the suspect and detective are dead. A Mississippi murder suspect used a Smith's gun to kill the detective and then himself inside police headquarters on Thursday, April 4, 2013. (AP Photo/Jackson Police) (The Associated Press)

Law enforcement officers wait at the entrance to the Jackson Police Department Thursday, April, 4, 2013, after police say a murder suspect fatally shot detective Eric Smith inside the headquarters. The suspect is also dead. (AP Photo/The Clarion-Ledger, Greg Jenson) (The Associated Press)

Jackson, Miss. Assistant Chief Lee Vance, center left, comforts Chief Rebecca Coleman, center right, Thursday, April, 4, 2013, after detective Eric Smith was shot and killed inside the Jackson Police Department. A suspect was also killed. (AP Photo/The Clarion-Ledger, Greg Jenson) (The Associated Press)

A person with knowledge of the investigation of a police officer who was killed by a murder suspect in an interrogation room says the shooting was recorded on video.

The person spoke to The Associated Press on Saturday on the condition of anonymity because they were not authorized to talk about the ongoing investigation. The person also said the suspect, Jeremy Powell, was not handcuffed during the questioning.

The Mississippi Bureau of Investigation says Powell overpowered Det. Eric Smith on Thursday and took his gun. Authorities say Powell shot the veteran detective four times before killing himself.

The AP has asked for the video to be released under open records laws, but authorities have not done so, saying it's part of their investigation.