Prince Philip, husband of the Queen of the United Kingdom Elizabeth II, dies at the age of 99, two months before his 100th birthday.
A non-restrictive appositive is set off by bracketing commas, which come in pairs for an appositive appearing mid-sentence. If you are asking if we can omit just the one before 'dies', then no.
We include either a comma pair, if we are incorporating a non-restrictive appositive, or none, if we are incorporating a restrictive appositive.
For this case, since Queen Elizabeth II was married only once, to Prince Phillip, a non-restrictive appositive should be used.