Japantoday.com reported that Japanese police said Thursday that TV celebrity Ai Iijima died due to a yet-to-be-specified cause one week before her body was found at her condominium in Tokyo’s Shibuya Ward on Wednesday.

According to the Metropolitan Police Department and other sources, a postmortem conducted Thursday could not pin down the cause of her death. Several types of pharmaceutical products such as the sleeping pill Halcion and cold medicines—all prescribed by doctors—were found in the condominium but no suicide note was found, they said.