Police in Amsterdam are set to use a life-size hologram of a murdered sex worker to try to catch her killer 15 years after her death. The hologram will show Bernadett 'Betty' Szabo sitting on a stool behind a window as she reaches out to passersby for help. Amsterdam police said they launched a 'major investigation' after her body was discovered, but the case went cold after detectives were unable to solve it. The force has since reviewed the case and said they will make a 'final attempt to find the perpetrator' by using the hologram to encourage witnesses to come forward.