China Labor Watch is reporting that several workers at Apple supplier Pegatron have died suddenly, including Shi Zhaokun, a 15-year-old worker. These workers “passed away in a very short period of time,” and Pegatron failed to carry out “in-depth investigations into the causes of death,” according to China Labor Watch. CLW is demanding that Apple and the factory perform autopsies to verify the reasons for the workers’ deaths. Zhaokun reportedly died of severe pneumonia on Oct. 9, though the respiratory infection was apparently determined to be from non-contagious causes. He worked at Pegatron making Apple products, where “the factory demanded workers to work for 12 hours each day.” Pegatron assembles the iPhone 5c, among other products. CLW is seeking donations for an independent autopsy into the boy’s death.