'Lizzie McGuire' Dad Robert Carradine Died in Hospital

Robert Carradine — the actor best known for his roles in “Lizzie McGuire,” “Revenge of the Nerds,” and “The Long Riders” — died in a hospital … TMZ has learned.

The Los Angeles County Medical Examiner revealed Robert’s place of death in new documents obtained by TMZ … but the docs don’t include a cause or manner of death.

Robert died Monday, and his family said he took his own life after battling bipolar disorder for two decades.

The death shocked Hollywood … but as we first told you, there were troubling signs on his final film project … with one of his most recent colleagues telling us he went MIA from a film.

Hilary Duff played Robert’s onscreen daughter in “Lizzie McGuire,” and she said his death “hurts” and she’s “deeply sad to learn Bobby was suffering.”

He was 71.

RIP