United Kingdom, Dec. 23 -- Rob Reiner and Michele Singer Reiner died "minutes" after sustaining "multiple" knife wound injuries, their death certificates have revealed.

The documents - obtained by People magazine - confirm that The Princess Bride filmmaker and his wife died of "multiple sharp force injuries" inside their Los Angeles home on December 14 caused "with (a) knife, by another".

The death certificates reveal that Rob, 78, was found first at 3:45 pm, before Michele, 70, was discovered at 3:46 pm.

The pair have since been cremated.

Rob and Michele's 32-year-old son Nick - who had battled addiction issues and was reportedly being treated for schizophrenia - has been arrested and charged with their murders.

Meanwhile, the coupl...