(CNN)Former "Happy Days" child star Erin Moran, 56, likely died from complications of Stage 4 cancer, the Harrison County (Indiana) Sheriff's Department and medical examiner said Monday in a joint statement.
Moran was found dead in her home in New Salisbury on Saturday, authorities said.
"A subsequent autopsy revealed that Mrs. Moran likely succumbed to complications of Stage 4 cancer," the statement said.
Standard toxicology tests were performed and the results are pending, the statement said, but no illegal narcotics were found at Moran's residence.