Larry Rasky might one day have been White House chief of staff.

One of Joe Biden’s most trusted advisers and friends, Rasky a few months ago enlisted to be treasurer of Biden’s super PAC, Unite the Country, and was a dogged and loyal Biden supporter through and through.

But now we’ll never know. Rasky, 69, head of an iconic Boston public relations firm, died Sunday — just as Biden was getting set to clinch the Democratic nomination. He died at home. The cause of death was not immediately released.

“He loved and was loved by so many,” said a statement by his company Rasky Partners. “He always treated the company like a family and we are all shocked and saddened by the news of his passing. He has left an indelible imprint on everyone he touched and the company that bears his name will go on in his spirit.”

Rasky worked or consulted for just about every well-known Democratic politician in the state — from senators and congressmen to mayors. His clients ranged from huge health care firms like Harvard Pilgrim to major nonprofits like the Greater Boston Food Bank to other Boston institutions like the Museum of Science. But lately Rasky was all about Joe Biden.

“There’s no question Biden really liked Larry and relied on him for a lot of stuff,” said Mark Horan, who worked for Rasky for seven years.

Rasky was also a guru to many young political strategists and PR veterans around the country. Even though he was in a cutthroat business, Rasky had a gregarious personality and he never took criticism too personally. He was always accessible — calling journalists back even when the story wasn’t one he wanted.

“I first met Larry Rasky in the 80’s, when he was comms operative for @JoeBiden to whom he remained loyal and committed for decades to come. Boston thru and thru, he was a great, ebullient pol. RIP,” former Obama consultant David Axelrod tweeted.

Mayor Marty Walsh, who enlisted the PR strategist over a federal probe into labor union tactics, said, “Boston grieves the loss of Larry Rasky, a well-known and respected political strategist, trusted adviser and good friend to so many. After decades of a successful career, Larry has left a mark that will never be forgotten.”

George Regan, another Boston PR guru who had competed with Rasky, said he had recently discussed with Rasky “working together, but alas, that will never happen.”

It was clear Rasky was gearing up for a big fight with President Trump .

In one of his last tweets last week, Rasky tweeted about the coronavirus, saying, “You can’t bomb it. You can’t yell at it. You can’t ignore it. You can’t bully it. You can’t really blame anyone for it. The only thing you can do is solve the problem. That’s one card #DonaldTrump doesn’t have in his deck of magic cards.”