Aetna sent a letter to the State of Connecticut telling them they were withdrawing from the Access Health CT Exchange, among other states.  According to an article in Benefits Pro.com:

Aetna has also withdrawn from offering individual plans in Maryland and Georgia, said Susan Millerick, an Aetna spokesman.

“We have spent considerable time identifying those states in which we can be competitive and add the most value to the market,” said Millerick, adding how the insurer is continuing to analyze Aetna’s overall company strategy, including the impact of Aetna’s recent acquisition of Coventry Health Care Inc.

The remaining insurers in the individual exchange will be Anthem, Connecticare and HealthCT.