Five people were killed and one wounded early Friday in a shooting in an Oshawa home east of Toronto, local media reported.
The shooting happened around 0520 GMT Friday. Police said four males and one female are among the dead.
The wounded woman found inside the home was transported to the hospital in a serious but non-life-threatening condition.
The deceased victims are believed to be three adults and two teens, police media spokesman George Tudos said.
One of the dead is the alleged suspect, he said.
A husband and wife, who are teachers, have lived at the home with their four children for many years and recently returned home after spending time at a cottage, neighbors said.
Police said they were not looking for any more suspects and there were no safety concerns in the community.
Investigation into the shooting is underway.