Jenkins script: stop & kill stuck build

jenkins-jenkins-stop-and-kill-stuck-build.groovy

// Execute this script in the Jenkins script console

def jobname = "the-job-name"
def buildnum = 85

def job = Jenkins.instance.getItemByFullName(jobname)
for (build in job.builds) {
  if (buildnum == build.getNumber().toInteger()) {
    if (build.isBuilding()){
      build.doStop();
      build.doKill();
    }
  }
}