SEE IT: Jailhouse video shows “feeble old man” Golden State Killer exercising & climbing furniture in cell 

California authorities have released jailhouse footage showing the Golden State Killer exercising and moving freely in his cell — while appearing in court as a “feeble old man.”

The newly-released videos from June and July show Joseph DeAngelo, 74, climbing on furniture, exercising in front of a mirror, and effortlessly bending down to put on socks. Sacramento District Attorney Anne Marie Schubert said the footage proves DeAngelo doesn’t deserve sympathy.

“Is he a feeble, old, 74-year-old man? Is he psychologically impaired? Is he physically impaired? Is he even competent to stand trial or to enter those guilty pleas we saw on June 29 when he rolled in here in a wheelchair and feigned feebleness?” Shubert asked of DeAngelo, according to KCRA.

“The answer to those questions that so many people have wondered for the last two years lies within the definition of a sociopath.”

How do you protect your children from predators? Join Nancy Grace and a team of world-class experts for the online course ‘Justice Nation: Crime Stops Here’.

In court, DeAngelo often appeared frail and disconnected and required a wheelchair or cane.

DeAngelo ultimately pleaded guilty to committing a series of rapes and murders in California in the 1970s and ’80s. On Friday, he was sentenced to life in prison without the possibility of parole.

“The truth of who Joseph DeAngelo is lies not just in what happened in the courthouse but what has happened in his jail cell,” Schubert said.

“One only needs to look back a few months from today to see the real Joseph DeAngelo.”

For the latest true crime and justice news, subscribe to the ‘Crime Stories with Nancy Grace’ podcast. Listen to a related episode:

Join Nancy Grace for her new online video series designed to help you protect what you love most – your children.

[Featured image: Sacramento District Attorney’s Office]