Police are investigating the death of a 90-year-old naturalist and Steuben resident who died on Oct. 5.

The state Medical Examiner’s and Washington County sheriff’s offices hope to conclude their investigation into the death of Ralph Widrig within several weeks, said Mark Belserene, spokesman for the medical examiner.

“The case is currently pending further studies,” Belserene said in an email on Wednesday. “The case may take two weeks or longer depending on the overall caseload.”

Widrig was known in Maine for contributing to several studies of birds and plants. He is cited as a contributor to A Birder’s Guide to Maine, a 1996 book by Elizabeth Pierson, and Petit Manan National Wildlife Refuge Manager Brian Benedict told the Ellsworth American that Widrig was the first volunteer to work at the refuge.

Widrig studied birds and their habitats in Washington state, Florida, California and Vancouver, according to a Google search.

The Washington County sheriff’s office did not respond to messages left on Wednesday.