Sioux Falls Police have released the name of the man killed in a weekend motorcycle vs. bus accident near Yankton Trail Park in Sioux Falls.

49-year old Thomas Bierne was killed when the motorcycle he was driving collided with a school bus from the Harrisburg school district that was turning into the park to pick up students from a cross country meet.

Bierne's wife Michelle remains hospitalized in serious condition. Neither rider was wearing a helmet when the bus turned left into the park and in their path. The bus driver, Nancy Horner, was hospitalized with minor injuries.

Investigators are still trying to determine if speed was a factor in the crash. No charges have been filed at this time but a police spokesman said charges are possible against the bus driver.

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