What now for coach-less Murray?
Their split was announced on Tuesday night in a brief statement from Murray's management company which suggested the partnership had simply run its course.
"I've had a great relationship with Miles over the past two-and-a-half years and I want to thank him for his positive contribution" said Murray.
Maclagan said: "It's been a privilege to work with Andy as his coach and I'm happy to have played my part in his career."
All very amicable then. You have the CDs, I'll keep the sofas.
The role of Alex Corretja (right) is believed to have played a part in Maclagan's (left) departure
But a there is slightly more to this break-up than meets the eye. The balance of power within the Murray camp, not always obvious, is believed to be central - specifically the role of Alex Corretja, the Spaniard who has worked part-time as a coaching consultant since the 2008 clay-court season.
Maclagan had flown to the United States to be at Murray's side in preparation for the US Open and all appeared rosy. He had every intention of continuing in the job and Murray, despite speculation, had no dark plan to sack him.
But with former world number two Corretja also at the training camp in Miami, the situation quickly changed. On his arrival at the weekend, Maclagan is believed to have sought clarity on the coaching situation.
Murray seemingly decided to resolve matters there and then.
After just a couple of days, and with his bags packed for a month, Maclagan was on the next available plane home with Murray taking a last-minute wild-card entry into the Los Angeles tournament. A total change of plan.
Corretja, I am told, has been retained on his part-time contract of around 12 weeks a year, although confusingly he has also flown home, leaving Murray coachless ahead of the US Open.
Murray now has the opportunity to scour the market and bring in a Grand-Slam winning coach if he wants to, can find one and can afford one.
Maclagan, relatively speaking, represented extremely good value for money and a top-name coach will cost considerably more, particularly considering the consultancy and media fees most of the high-profile guys command.
Australian coach Darren Cahill is a potential candidate to replace Maclagan
Larry Stefanki, who turned the job down in 2006 before Brad Gilbert was hired, now works with Andy Roddick. Paul Annacone, leaving the LTA at the end of the year, is about to start a fascinating trial period with Roger Federer.
Darren Cahill - Andre Agassi's former coach - is employed by Murray's new kit sponsor and some form of link there is one of the more obvious possibilities. Cahill's easy-going demeanour appeals to Murray. A chatterbox is not required for this vacancy.
Of course there are many leftfield options, including plenty of former champions always keen to keep themselves in the public eye and, while a British contender appears unlikely, it's worth noting that Murray recently trumpeted the attributes of a little-known coach from Scotland, Iain Hughes, when the Davis Cup captaincy was available.
Whatever the circumstances, Maclagan should leave the job with his head held high. He helped Murray to two Grand Slam finals, 11 titles including four Masters Series shields, and a peak of number two in the world.
His calming personality played a part in helping Murray mature on and off the court; as a practice partner he was as effective as they come and he soaked up Murray's occasional rants with admirable stoicism.
The extent of his influence was always unclear - indeed at times he appeared little more than a glorified hitting partner. The fact he was never allowed to give interviews told its own story. He was never the boss, just an employee in "Team Murray". No wonder he sought clarity.
But that is the curiosity of the player/coach axis in tennis. The player pays the bills. The player hires and fires. That's life on tour.
Maclagan was in a dream job, yet in many ways it was an impossible one.