MINNEAPOLIS (WCCO) — Authorities in Willmar say a driver may have had a medical emergency before a fatal crash Thursday morning.

According to the police department, deputies responded around 9:45 a.m. to a crash at South 1st Street and Willmar Avenue.

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Upon arrival, officers noticed that a minivan, driven by 63-year-old Michael Rieke, had rear-ended a pick-up truck, driven by 87-year-old Vernon Spieker.

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Rieke was transported to a nearby hospital where he later died. Preliminary investigation indicates that Rieke may have had a medical emergency leading up to the crash, the police department said.

Officials say this appears to be a low-speed crash.  No other injuries were reported.

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The incident remains under investigation.