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Miller died at his Pasadena home on March 29 after battling chronic obstructive pulmonary disease and congestive heart failure, according to his son Scott.

Smith has received immunotherapy treatment for a rare form of lung cancer called pulmonary pleomorphic carcinoma, which he said had helped shrink his tumours significantly.

Of the 10 people who were infected, eight experienced hantavirus pulmonary syndrome, five required intensive care with ventilatory support, and three died.

Arakawa died from hantavirus pulmonary syndrome, a disease that attacks the respiratory and cardiovascular systems, Dr. Heather Jarrell, chief medical examiner at the New Mexico medical investigator’s office, said at a news conference.

The pair both suffered fractures, lacerations, bruises and pulmonary oedema - where excess fluid builds in the lungs - as a result of the quad bike being "dragged" across the road during the crash.