I found a link to where Michael said Terri had a heart attack.
Her husband, Michael Schiavo, who witnessed her collapse, says that Terri, then 26, had a heart attack caused by a low potassium levelpossibly due to an eating disorder. This is the theory Michael, a nurse and respiratory therapist, successfully presented in a malpractice suit against Terris doctors. The jury award was over $1 million: $300,000 for Michaels loss of companionship and $750,000 for Terris ongoing care and rehabilitation.
http://www.internationaltaskforce.org/iua29.htm
You know how it is with wives who make their husband furious by spending $80 on a haircut. They get up at 5:30 in the morning and have a heart attack.