(New York Daily News) Remorseless mass-murder suspect James Holmes was locked up alone Saturday over fears that the self-proclaimed Joker would become a target for other inmates.

The man accused in the Colorado movie theater massacre was still behaving erratically on the day after his rampage at a midnight screening of “The Dark Night Rises” — the last film in the Batman trilogy.

“Let’s just say he hasn’t shown any remorse,” a jail employee told the Daily News. “He thinks he’s acting in a movie.”

A released inmate said Holmes’ behavior behind bars was increasingly irrational.

“He was spitting at the door and spitting at the guards,” the inmate told The News. “He’s spitting at everything. Dude was acting crazy.”

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