The actor's character Andrew Cotton was left devastated in last night's (March 21) episode as he discovered that his fiancée had been killed.
Speaking on Lorraine today, Grover confessed that it wasn't difficult to appear emotional on screen as he was sad over the departure of co-star Cheryl Fergison, who played Heather.
Grover explained: "I am [sad], there were genuine tears there. There was no tearstick needed!"
Discussing how Andrew finds himself in the frame for the murder, he joked: "I get the blame for everything, me! I don't know what I can do right. It's all going to point towards me, because we've seen Andrew's temper a little bit."
The 50-year-old also said that he is backing Fergison's desire to pursue a possible music career following her EastEnders departure.
"She's a good singer, a very good singer," he remarked.
Reflecting on life at EastEnders, Grover added: "For me, it's like being in my front room - I love it! Everyone talks the way I talk, so it's not really like acting for me."
Grover recently confirmed that he will be staying on EastEnders for another year.
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Watch Heather's EastEnders character trail in the video below: