Prince
Prince performs during the halftime show of the NFL's Super Bowl XLI football game in Miami, Florida, U.S. February 4, 2007. Reuters/Mike Blake

The cause of Prince’s death on Thursday remains unknown. Among the speculations that Prince Rogers Nelson died from flu, Zika virus and drug overdose.

TMZ reports that on Sunday, six days before his plane made an emergency landing in rural Illinois, he received treatment for drug overdose. Citing its multiple sources, the entertainment website says that doctors gave the 57-year-old singer a “save shot” which is typically given “to counteract the effects of an opiate.”

The portal also question why the plane of Prince made an emergency landing when he was only 48 minutes from home in Twin Cities if he was battling only flu as his representatives announced. Prince left the hospital an hour later even if the hospital staff, who wanted the singer to stay for 24 hours, objected, reports The New York Daily News. StarTruibune cites a source who says that Prince was dehydrated on the flight home.

Meanwhile, one more speculation comes from another music icon, Aretha Franklin, who believes Prince’s death was caused by a Zika virus infection. In a live interview with MSNBC’s Brian Williams, Franklin was quoted as saying, “They’re saying flu-like symptoms. I’m wondering if it has anything to do with this Zika virus.”

Daily Mail reports that Prince had previously revealed that he suffered from epilepsy as a child when he had seizures. As a result, he was bullied in school because of his condition. However, he claims to have been cured by an angel, the androgynous singer – a Jehovah’s Witness – told his mother.

It in unknown if the epilepsy never returned, although his song “The Sacrifice of Victor” is about an epileptic boy until the age of seven. According to the US Center for Disease Control and Prevention (CDC), epilepsy could make patients more vulnerable to developing serious complications from the flu.

Among the flu complications that the CDC has listed include pneumonia and death, but the warning was for children with neurologic conditions, including epilepsy. Such kids could also have trouble with muscle function, lung function, difficulty swallowing or clearing fluids from the airways.