Without looking at the attic it is very hard to tell if you can start removing wall studs. That said one stud should not have any effect on the home's assembly but only someone familar with framing or an engineer can tell for sure.
I was taught a trick from an old timer years back that involves using the "Saws-all" as a guide. You cut through the stud slowly and if the weight above bears down on your tool blade you stop and fix. If the tool cuts clean through with no binding there is little chance any load is there now. This does not mean that when your roof has 2' of snow that stud does nothing for the home's mechanics.
Most point loads will be supported by multiple studs ie: 2- 2"x6"'s 3-2"x4"'s or more so if you expose the stud and find only one you should be alright.
Do you have anyone that can peak into the attic for you and look?