When Tina confronted Gray about her suspicions, he turned violent and strangled her to death.
The serial killer struck again earlier this year when he killed Kush Kazemi (Davood Ghadami).
He murdered Kush after growing jealous over his relationship with Whitney Dean (Shona McGarty).
When a fight broke out between the two men at a train station, Gray killed Kush by shoving him in front of an oncoming train.
Despite committing numerous murders in Walford, Gray has so far managed to get away with his crimes.
Eastenders continues Thursday at 7:35pm on BBC One.
source: express.co.uk