The Special Investigations Unit are in Niagara Falls investigating the circumstances surrounding an incident at a motel.
The incident took place around 4 o'clock Saturday morning.
The NRP received a call regarding a disturbance at a motel on Lundy's Lane near Kalar Road.
Officers interacted with several persons upon arrival and arrested a 42-year-old man from St. Catharines.
Following his arrest, the man was treated for a serious head injury in hospital.
Two investigators and one forensic investigator have been assigned to this case.
Anyone with information is urged to contact the SIU at 1-800-787-8529.
The Unit is also urging anyone who may have any video evidence related to this incident to upload that video through the SIU website.