Prosecutors have filed murder and attempted first-degree homicide charges against the man arrested in a hostage standoff at a Wisconsin motorcycle shop.

One man died and a police officer was injured after a bullet bounced off his helmet in the four-hour standoff Dec. 5 at Eagle Nation Cycles in Neenah.

According to an amended criminal complaint, Brian Flatoff was charged Wednesday.

Flatoff's attorney, Colleen Bradley, hasn't returned a call seeking comment on the new accusations.

Flatoff had been charged with felony reckless endangerment and other crimes after authorities said he fired a bullet into a woman's bedroom wall after a night of drinking. Those charges arose from events that Winnebago County prosecutors say preceded the standoff.