No, it is generally not illegal for an employer to terminate and employee while they are on disability leave. It is common to terminate someone while they are on disability and is not against the law unless the employee is under the FMLA regulations. These regulations do not apply to every employer so the circumstances and facts of your case must be evaluated closely to determine what the proper course of action might be. For this reason it would be beneficial to sit down with an experienced employment law attorney to educate you on your rights.
If you have any questions regarding employment law in Connecticut, please contact Joseph C. Maya, Esq. at (203) 221-3100 or e-mail him directly at JMaya@Mayalaw.com.