In most cases, the person who took the pictures is the owner of the copyright. For example, a wedding photographer owns the copyrights to the pictures they take even though the bride and groom are in most of the pictures and paid the photographer to take the pictures. The church doesn't own the pictures taken there. The reception hall does not own the pictures taken there. Transfer of the ownership of the copyrights require a signed writing. If the ex employee did not take the pictures, you can get ownership of the pictures from the person who did and file suit.
If copyright infringement is not an option, you can also try unfair competition. Most states have broadly written unfair competition laws to protect businesses from competitors misleading customers for the purposes of gaining an unfair business advantage.
Keep in mind, even if you successfully get the ex employee to stop the using those pictures to advertise, you may find the court awards you less in damages than your legal counsel will cost.
Good luck,
Todd
Answered on Dec 16th, 2013 at 10:46 AM