The Queen Vic's chef - played by Chucky Venn - had been among five suspects named in the storyline, which has seen Kat (Jessie Wallace) cheating on husband Alfie with an unknown man over the past few weeks.
Viewers now know that Ray cannot be the individual in question as tonight's (August 7) EastEnders episode saw him interrupt Kat as she was on the phone to her lover.
The scene was the first time that one of the suspects has been firmly ruled out from the ongoing storyline.
Michael Moon (Steve John Shepherd) and Branning brothers Derek, Jack and Max (Jamie Foreman, Scott Maslen and Jake Wood) have now been left as the remaining men in the frame.
The options are likely to be narrowed down further in the coming weeks as show bosses have promised to "eliminate the suspects one at a time, leading to one almighty explosion".
EastEnders continues on Thursday (August 9) at 7.30pm on BBC Two. Get the Inside Soap magazine on your iPhone or iPad