// Delete method deletes an heartbeat from OpsGenie.
func (cli *OpsGenieHeartbeatClient) Delete(req heartbeat.DeleteHeartbeatRequest) (*heartbeat.DeleteHeartbeatResponse, error) {
	req.APIKey = cli.apiKey
	resp, err := cli.sendRequest(cli.buildDeleteRequest(deleteHeartbeatURL, req))

	if resp == nil {
		return nil, err
	}
	defer resp.Body.Close()

	var deleteHeartbeatResp heartbeat.DeleteHeartbeatResponse
	if err = resp.Body.FromJsonTo(&deleteHeartbeatResp); err != nil {
		message := "Server response can not be parsed, " + err.Error()
		logging.Logger().Warn(message)
		return nil, errors.New(message)
	}

	return &deleteHeartbeatResp, nil
}