Tito Karnavian told reporters in Indonesia's Aceh province that Siti Aisyah, 25, was paid to be involved in "Just For Laughs" style pranks, a reference to a popular hidden camera show.
He said she and another woman performed stunts which involved convincing men to close their eyes and then spraying them with water.
"Such an action was done three or four times and they were given a few dollars for it, and with the last target, Kim Jong Nam, allegedly there were dangerous materials in the sprayer," Karnavian said.
Karnavian's comments come after a male relative of Aisyah said in an Indonesian television interview that she had been hired to perform in a short comedy movie and traveled to China as part of this work. Indonesian Immigration has said Aisyah traveled to Malaysia and other countries, which it did not specify.
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South Korea has been quick to accuse its enemies in North Korea of dispatching a hit squad to kill Kim Jong Nam at the airport in Kuala Lumpur, saying two female assassins poisoned him and then fled in a taxi.
North Korean diplomats in Malaysia have requested custody of Kim Jong Nam's body, arguing that he had a North Korean passport. The officials objected to an autopsy, but Malaysian authorities went ahead with the procedure anyway because they did not receive a formal complaint.
Investigators were still trying to piece together details of the case, and South Korea has not said how it concluded that North Korea was behind the killing.
Dizzy and in pain, he told medical workers at the airport he had been sprayed with a chemical. Within two hours, Malaysian officials said, he was dead.
Kim Jong Nam, who was 45 or 46, had lived in exile for years and was estranged from his younger half brother, the North Korean leader Kim Jong Un. He reportedly fell out of favor in 2001, when he was caught trying to enter Japan on a false passport to visit Tokyo Disneyland.
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