Police are investigating whether the fatal stabbing attack on a Belgian day care center was timed to mark the first anniversary of actor Heath Ledger's death, The Telegraph reported.

Suspect Kim De Gelder's face was gruesomely painted black-and-white to resemble Ledger's character, the Joker, from "The Dark Knight." Witnesses also said he dyed his hair red.

When the 20-year-old was arrested, his only words were, "I have a question," The Telegraph reported. The statement is similar to a scene in the film where the Joker violently crashes a party and asks, " I only have one question: where is Harvey Dent?"

Ledger, 28, was found dead on Jan. 22, 2008 in a New York apartment. His death was ruled an accidental overdose of prescription drugs.

De Gelder is suspected of killing two babies and a caregiver at the Fairyland day care center Friday in Dendermonde, as well as seriously wounding 12 others, including 10 young children, in a rampage so bloody it left rescue workers shaken. He was arrested the same day when he calmly rode his bike away from the scene.

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Former classmates described De Gelder as a "film freak" and "movie addict," according to the newspaper.

Police said Monday they think De Gelder may have also killed a 73-year-old grandmother on a remote farm 10 days ago and had plans to attack two more nurseries.

Witnesses said when the elderly woman was murdered the previous Friday, they also saw a man calmly riding away into the night on a bike.

De Gelder is not cooperating with the investigation, police said.

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The Associated Press contributed to this report.