United Kingdom, March 8 -- There are still "loopholes" to close in the investigation into Gene Hackman and Betsy Arakawa's deaths.

Although Dr. Heather Jarrell, New Mexico's chief medical examiner, revealed the 95-year-old actor died from "significant heart disease" one week after his wife Betsy, 65, passed away as a result of hantavirus - which is a rare flu-like illness carried by infected rodents - on February 11, the case is not yet closed.

Santa Fe County Sheriff Adan Mendoza said in a press conference that authorities are still continuing their investigation to close a few more "loopholes," and they will take a closer look at Gene and Betsy's cellphones in order to do so.

They are also awaiting necropsy results to help determine ...