Doctor Grey was a doctor at Dee Valley University Hospital who met with Paul Browning in July 2013. Grey suggested that Browning was too young to be a consultant and brought up the death of Lynsey Nolan, causing Browning to explode and lash out at a horrified Doctor Grey. A few weeks later, Grey confronted Browning over the purposeful misdiagnosis of Myra McQueen and suspended him. In late-August 2013, Grey decided to fire Browning and threatened to have him arrested.
In February 2014, Doctor Grey took over the treatment of baby Katy O'Connor from Lindsey Butterfield after the situation got heated between Lindsey and the O'Connor family. After Katy died of cardiomyopathy, Doctor Grey lead an investigation into how Lindsey handled Katy's previous hospital admissions. In May 2014, Doctor Grey confronted Sandy Roscoe over theft of hospital records, which Sandy confessed to.
Doctor Grey was one of several hospital staff held hostage by gangster Big Bob in October 2014. Doctor Grey managed to escape through the doors of the hospital, with Big Bob attempting to shoot her but accidentally shooting Freddie Roscoe instead.