Rewrite this as ONE clean news headline. Do NOT give multiple options. Do NOT use bullet points or lists. Return only one sentence. Title: Pilot in plane crash that killed North Dakota lawmaker was former Mayo Clinic doctor – InForum

By Accident Newswire Staff
🗓 Published: April 28, 2026 11:47 PM (3 hours ago)

ROCHESTER — A retired Mayo Clinic doctor was one of two people who died in a plane crash Saturday in Brooklyn Park, Minnesota,

multiple

outlets

report.

Dr. Joseph Cass retired from Mayo Clinic in Rochester in May 2017, according to a

Mayo Clinic Alumni Association article.

The crash killed North Dakota state

Rep. Liz Conmy,

a Democrat representing the Fargo area. Minnesota Public Radio

reports

that the two were romantic partners.

Cass was believed to be the pilot of the small plane that crashed shortly after takeoff on April 25.

Cass first joined Mayo Clinic in 1983, following his

orthopedic surgery residency

there. He left in 1986 and spent nearly two decades practicing medicine in Sioux Falls, South Dakota, and the Twin Cities. Cass returned to Mayo Clinic in 2005.

When asked about his retirement, Cass said in the alumni article that “[a]s long as I'm learning something, I'll be content,” and expressed his desire to take flying lessons.

North Dakota Gov. Kelly Armstrong reacted to Conmy's death

in a statement

released Saturday.

“Liz served her state and community with care and compassion, from her service in the Legislature and on the state's Human Trafficking Commission to her work on education, habitat and immigration,” Armstrong said. “… We ask North Dakotans to join us in keeping them in our prayers.”

Dené K. Dryden is the Post Bulletin's health reporter. Readers can reach Dené at 507-281-7488 and ddryden@postbulletin.com.

Accident by details

Features
Features
Features

Request An Accident Report

Scroll to Top