(NewsNation) — The junior coroner who performed the autopsy of Marilyn Monroe still has his doubts over the circumstances of her death, 63 years on.

Monroe died Aug. 4, 1962, at the age of 36. Evidence has long pointed to suicide, but some have their doubts.

Coroner Thomas Noguchi, 98, performed the autopsy and told author Anne Soon Choi, in her book L.A. Coroner, he felt "alarm bells going off on his head" when the head toxicologist refused to run additional tests.

Choi said "a wave of anxiety" washed over Noguchi, via the Daily Mail. According to the author, he was never able to fully free himself from doubts over what really may have happened to Monroe.

Following Monroe's death, the public was told Monroe died at her own hand via the ingestion of sleeping pills.

"When he does the e

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