Bryan Randall, Sandra Bullock’s longtime partner, died over the weekend at the age of 57, according to a statement from his family provided to PEOPLE on Monday.

“It is with great sadness that we share that on Aug. 5, Bryan Randall passed away peacefully after a three-year battle with ALS,” his family shared. “Bryan chose early to keep his journey with ALS private and those of us who cared for him did our best to honor his request.”

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“We are immensely grateful to the tireless doctors who navigated the landscape of this illness with us and to the astounding nurses who became our roommates, often sacrificing their own families to be with ours,” his family added.

“At this time we ask for privacy to grieve and to come to terms with the impossibility of saying goodbye to Bryan, His Loving Family,” the statement concluded.

Who was Bryan Randall?

Bryan Randall and Sandra Bullock had been dating since 2015, but they preferred to keep their relationship low-key and avoid being in the public eye together.

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Bryan was a working professional photographer who has spent some time in Los Angeles. Bryan Randall Photography, the business he owned and successfully ran, specialized in outdoor photography and kid portraiture.

Although he liked living with Sandra in California, he was actually from the northern West Coast, namely Portland, Oregon. The “word on the Portland street” in 2015, according to a source, was that he was dating Sandra, and “everyone [thought] it was great he was dating [Sandra].”

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Bryan has an adult daughter named Skylar Staten Randall from a prior relationship, just like Sandra who has two adoptive children, son Louis (b. 2010) and daughter Laila (b. 2012). The doting father was a great family man, a source previously told PEOPLE in 2015, despite the fact that little is known about their father-daughter bond.

According to a family friend, “He’s a great guy and had a great family life growing up.” “His parents are amazing people. Everyone is really proud of him for being a talented photographer and model.”