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Parker, 32, told OK! that he'd been suffering seizures and was shocked to learn of his diagnosis. Glioblastoma is rare and experts have said that it is among the deadliest type of brain cancers. It affects an estimated 13,000 people in the United States every year and there is no cure. Senators John McCain and Ted Kennedy were both diagnosed with and ultimately died from the disease.

“They’ve said it’s terminal,\" Parker said of his prognosis. \"It was a lot to deal with by myself. I still haven’t processed it.”

The singer said that he will undergo radiotherapy and chemotherapy treatment as he and his wife Kelsey await the birth of their second child. They are parents to a 15-month-old daughter.

“I don’t think Tom will ever process this information. It’s horrendous,” his wife told OK!. “Watching your partner go through this is so hard, because how can I tell him not to let it consume him?\"

ABC News' Hayley FitzPatrick contributed to this report.

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