Kennebunkport Fire Chief Paul Moshimer will face a grand jury in January.
Moshimer learned he could face indictment on a charge of aggravated assault during a court appearance Oct. 27 at York County Superior Court in Alfred.
Moshimer was arrested Friday, Sept. 18 and charged with aggravated assault in Wells after  officers arrested him around 10 p.m. outside the Burnt Mill Road home of Peter Dugovic, according to Wells Lt. Jerry Congdon.
Congdon said Moshimer allegedly struck Dugovic with his motorcycle helmet after he drove by the home, saw his fiance’s car in the driveway and confronted Dugovic.
Moshimer was taken to York County Jail in Alfred and freed on $1,000 cash bail by Tuesday, Sept. 20.
Congdon said Moshimer was carrying a .45 caliber pistol in his jacket, which he took off and handed to officers, telling them it contained a gun.
The permit for the gun expired in February 2009, according to Congdon.
Kennebunkport Town Manager Larry Mead said Moshimer will remain on paid administrative leave for an undetermined amount of time.