They made the assessment after researching newspaper records of 'family annihilator' events from 1980 to 2012.
They found that a family break-up was the most common trigger, followed by difficulties financially and honour killings, the BBC reported.
The four types of these men are:
1. Self-righteous: These types of killers seek to locate blame for their crimes upon their mother, who they hold responsible for the breakdown of the family.
2. Anomic: The family becomes firmly linked to the economy in the mind of the killer; the father begins to see his family as the result of his economic success, allowing him to display his achievements. However, if he becomes a failure, he looks at the family, as no longer serving this function.
3. Disappointed: This killer believes that his family has let him down or has acted in ways that undermines or destroys his vision of ideal family life.
4. Paranoid: People who perceive an external threat to the family; the father fears that the social services or the legal system will side against him and take away the children. Here, the murder is motivated by a weird desire to protect his family.
The study has been published in the Howard Journal of Criminal Justice.
--ANI (Posted on 15-08-2013)