LOS ANGELES ? A 42-year-old grandson of Walt Disney pleaded not guilty to charges of illegal possession of guns and drugs on Wednesday in a California court and was remanded in custody, authorities said.

Patrick Disney Miller, who already has a 2005 conviction for drug possession, was detained on December 9 after police conducted a search of his home in the Los Angeles suburb of Woodland Hills, local prosecutors said.

Miller had been freed on a 35,000 dollar bail, but at Thursday's arraignment the judge raised the amount to $550,000 and Miller was taken into custody. A new hearing was set for February 4.

Miller was originally charged with a single felony count, but prosecutors Wednesday filed 19 additional felony charges against him.

Police allegedly recovered an arms cache comprising 13 handguns, a rifle and an illegal assault rifle during the search. Various drugs were also found.

As a result of his 2005 conviction, Miller is barred from owning guns or ammunition, according to prosecutors.

Los Angeles Police Department officers obtained the search warrant after running a background check on Miller when they discovered he had allegedly purchased ammunition.

If convicted of all charges, Miller faces more than eight years in state prison. Miller is the youngest child of Diane Disney Miller, who is Walt Disney's only biological daughter.