Starfleet's first ever Klingon officer, Captain Worf (Michael Dorn) has killed around 27 Klingons during his history in Star Trek. While commanding the USS Defiant, Worf was even accused of killing 441 Klingon civilians, but this was revealed to be an elaborate deception on the part of the Klingon Empire to discredit Starfleet's highest-profile Klingon officer. For a society that is defined by both combat and honor, it's hardly surprising that Worf racked up some such a high kill count when it came to his fellow Klingons.
In Star Trek: The Next Generation, Worf's service record earned a black mark from Captain Jean-Luc Picard (Patrick Stewart), who objected to Worf killing a fellow Klingon while in Starfleet uniform, regardless of the shared traditions. With one or two notable exceptions, the killings committed by Worf after this admonishment were done so in the line of duty. Here are the estimated 22 Klingons that Worf has killed in both Star Trek: The Next Generation and Star Trek: Deep Space Nine.
