In 2004, the project was brought to a halt when James Hetfield checked into a California rehab facility, where he would spend the next six months, overcoming a drug addiction.
I though it should be there because I think it's a praticiple phrase modifying 'he', but it doesn't seem like it belongs.
Well, I'm not Clive, but would you say "I spent three hours, weeding my garden" or "I was at the beach all day, looking for sand dollars"?
I would leave out the commas there, and I would leave the bold comma in your original.
Should I remove it on the grounds that the comma would inturpt the subject from its verb?
It should not be there because you are saying that this place, the rehab center, is the place in which he is recovering. If you use a comma, then you're it sounds more like he is simply recovering from a drug addiction.
Can anybody back me up?
Can anyone come up with an explaination?