The pair, played by Diane Parish and Joshua Pascoe respectively, are the ninth and tenth possible culprits to be unveiled on the soap's official website.
EastEnders fans have tipped Denise as a likely perpetrator for some time as she has recently clashed with Phil (Steve McFadden) and has the biggest motive to dredge up the matter of Kevin's death.
Meanwhile, Ben remains the bookies' favourite to be revealed as the stalker after Phil struggled to accept his sexuality.
EastEnders bosses have previously put Michael Moon (Steve John Shepherd), Jack Branning (Scott Maslen), Janine Butcher (Charlie Brooks), Rainie Cross (Tanya Franks), Jay Mitchell (Jamie Borthwick), Ian Beale (Adam Woodyatt), Mandy Salter (Nicola Stapleton) and Alfie Moon (Shane Richie) on their official suspect list.
Two more possible stalkers are expected to be revealed by show chiefs in due course.
EastEnders continues on Thursday night at 7.30pm on BBC One.
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Watch Denise talking about her possible motives in the newly-released video below: