PC Keith Palmer, pictured 45 minutes before his death, was fatally stabbed by Khalid Masood, who had entered the parliamentary estate via an open gate. Picture: Facebook
PC Keith Palmer, pictured 45 minutes before his death, was fatally stabbed by Khalid Masood, who had entered the parliamentary estate via an open gate. Picture: Facebook

Widow of officer stabbed outside UK parliament in terror attack is to sue police chiefs