If you have an LLC Operating Agreement, then it should specify how to dissolve the LLC or how to 'buy out' one manager/member.
Are you a member, manager or managing member? Do you keep separate books for the LLC accounting?
Have you kept track of each other's contributions to the LLC? Did you have loan/note agreements for the contributions (suggested, but not too many people do it) or did you just contribute the money to the LLC bank account or creditors?
The answers to these questions will best determine how to answer your particular concern.
To protect yourself, you could file a UCC-1 form with the state that you are registered with. This is a form that details what a business owes you based on a contract, services or other actions you did for them. It requires that you have proof of what is owed to you, signed by the managers/directors/officers of the Company.
As I stated, I need to know a little more before I can give concrete advice. However,
based on the minimal information already, here are some options:
(1) Have the other manager(s) of the LLC sign a document detailing what you have put into the LLC and what you are to be paid upon termination and have them buy you out.
(2) If you do not have an operating agreement, check with your Secretary of State website and get the particular laws governing LLCs in Virginia. The laws should specify what the 'standard' terms of an LLC agreement are and which will be imposed if an Operating Agreement is not executed. My guess would be that they do not have a 'buy out' provision.
(3) Have an Operating Agreement with termination provisions executed by all Managers and then execute the termination process.
(4) You could sue the LLC for your contributions back, however if the LLC is bankrupt or insolvent, then the other manager(s) are only liable for what they have in the LLC. This is not a good option.
If you provide more information, I could better explain your options.