Team: a group organized to work together.
Webster's New Universal Unabridged Dictionary
When a woman commits serial murder, she is more likely to do so as a member of a killing team than to act alone. In fact, we estimate that approximately one third of all female serial killers have operated only as a member of a team and never committed a homicide except in the context of the team's criminal activities. A Team Killer is defined as a woman who systematically murders others or participates in the systematic murder of others in conjunction with another person. The perpetrator is considered a Team Killer even if she does not personally murder others but participates in the homicidal activities of the team.
We have identified three distinct types of serial-killing teams: (1) male/female teams, (2)female teams, and (3)family teams. Each of these teams enacts its crimes in a somewhat different manner. The team characteristics are defined by the individual activities of the dominant team member, the number of perpetrators on the team, the team's sexual makeup, and the individual relationships among team members. By definition, the male/female team is comprised of only two members, one of each sex. The female team is comprised of two or more women, and the family team is comprised of three or more members of both sexes.