Martinez will be Myra McQueen's boyfriend from Alicante. He comes to Chester following Myra, and is under the belief that she is the "Countess of Chester".
Diego arrives in a caravan listening to music with earphones, when closing his eyes, he doesn't see Holly Roscoe walking in front, Robbie Roscoe dives in front to save her. Diego is then seen again at Esther's Magic Bean where he walks into Darren Osborne, Darren then assumes he has stolen his wallet, Diego denies it. Jade Albright then picks it up and returns it, Diego asks to help him find the 'Countess of Chester'. Darren laughs in his face and walks away. Diego turns up at The Dog in the Pond where he asks Mac Nightingale to park his van in the car park, he says he can. Diego walks in in a towel while Reenie McQueen and Myra are planning the wedding. Diego says there is no hot water, Myra sees Diego and runs away. Diego catches up with Myra, the two speak, and Myra then reveals she isn't the 'Countess of Chester'. Diego doesn't mind until Myra calls him a joke and Diego orders Myra to leave.
Diego decides he wants a child, he asks Myra how old she is. Myra does not reveal but says she is close to 50. Myra and Diego try to have a test tube baby.
- 2015: Diego and Myra appear together as a couple.
- 2016 #1: A scene similar to the one above, but with pop art of their faces surrounding them.
- 2016 #2: Diego, Mac and Dirk toasting drinks