Murder-Suicide in the United States
...Police may have higher murder-suicide rates Several of the murder-suicide incidents in this study involved either current or former law enforcement officers... It has been estimated that twice as many police officers commit suicide than are killed in the line of duty. Studies that compare suicide rates show that law enforcement suicide rates exceed rates for both the general population and age/gender matched groups. No studies deal specifically with police officers involved in murder-suicide, but
Every major murder-suicide study ever conducted has shown that a firearm — with its unmatched combination of lethality and availability is the weapon most often used to murder the victims, with the offenders then turning the gun on themselves...
The presence of a gun allows the offender to quickly and easily kill a greater number of victims. If there had not been easy access to a firearm, these deaths may simply have been injuries, or not have occurred at all.