A life insurance firm has used a picture of murderer Harold Shipman in a new advertising campaign.Dead Happy used an image of the serial killer to promote its services with the tagline “Life Insurance. Because you never know who your doctor might be.”The Leicester-based company commercial was branded as "tasteless" and "disgusting" on social media.Senior insurance advisers across the UK have also slammed the advertising campaign.Harold Shipman worked as a GP for decades.“Doctor Death” was convicted of 15 murders in 1998 but is suspected to have potentially killed as many as 250 people between 1975 and 1998.