LOS ANGELES — Mickey Rooney signed his last will just weeks before death, leaving a modest estate to a stepson who had been his caretaker, but the actor had no intention of ending his Hollywood career anytime soon, his attorney said Tuesday.

Rooney’s death Sunday occurred after the actor began to have difficulty breathing during an afternoon nap, attorney Michael Augustine said. The actor had been in good spirits and was looking forward to continuing to appear in movies after filming a scene for the upcoming installment of the “Night at the Museum” franchise.

Augustine said Rooney, 93, passed a physical required before he could start filming and his death was due to natural causes, including complications related to diabetes.

Police and coroner’s officials were informed of Rooney’s death but said no investigation of it was necessary.

Rooney’s will was filed in Los Angeles Superior Court on Tuesday. It was signed by Rooney on March 11 and called for his stepson Mark Rooney and his wife to be the sole beneficiaries of the actor’s estate, which is valued at only $18,000.

The actor designated Augustine to serve as the executor of his estate, stating that he did not want any relative handling his final affairs.

Despite a show business career spanning more than 80 years, Rooney said he had lost most of his fortune because of elder abuse and financial mismanagement by another one of his stepsons. Augustine said despite an agreement for millions to be repaid to the actor, it was unlikely the estate could ever collect on the judgment.

Rooney’s will disinherited the actor’s eight surviving children, as well as his estranged wife. Jan Rooney will receive her husband’s Social Security benefits and some of his pension earnings as a result of a previous agreement; Augustine said Rooney felt that provided adequate care for her. He said Rooney’s children were in better financial situations than the actor, so he felt it was appropriate to leave Mark Rooney all he had left.