The body of Aaron Armstrong, 25, was discovered at his home in Blyth at 12.20pm on Tuesday.
Yesterday, Armstrong had posted an emotional tribute to Gradon.
Sophie, who appeared on Love Island alongside Olivia Buckland and Alex Bowen, died at her parents' home on June 22.
According to police, there was no third-party involvement in the death, and a report is being prepared for the coroner.
Salmon paid tribute to the late star after Gradon's shock death at age 32, saying that the world had "failed" her.
Aaron confirmed the ceremony was taking place as he shared a picture of the funeral booklet on Instagram with his 49,6000 followers, writing: "I love you with all my heart my attractive angel".
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A family friend, who wished to remain anonymous, said of Aaron's death: "We're absolutely gutted".
Aaron Armstrong, boyfriend of "Love Island" star Sophie Gradon, was found dead days after the reality star's funeral.
He wrote next to a picture of her: "just wish I could cuddle you all day".
Since Sophie's tragic death, most of Aaron's content on his Instagram involved pictures and videos of the two together. "Everyday we spent together was so incredible I need them days back".
Tragedy has hit the Love Island family again.
"I love you with all my heart Sophie u will always be in my heart you are my angel and I know you will be by my side everyday (sic)".