Five members of a family, including three children, were found dead under mysterious circumstances at Vazhikkadavu in neighbouring Malappuram district on Saturday, police said.
The 45-year-old head of the family was found hanging from a tree while the bodies of his wife and three children with injuries were recovered from their house.
Police said they suspect the man could have killed the four and committed suicide.
The man, a hotel worker, had not been attending work for the last six months, police added.