Bankers Life and Casualty Company has started selling Medicare supplement insurance in the Bay State after an 8-year absence from the market.

Bankers Life, Chicago, a unit of Conseco Inc., Carmel, Ind., says 100 career agents in offices in Framingham, Holyoke and Mashpee will be marketing the Massachusetts Medigap plans.

Bankers already has about 5,700 current Medigap policyholders in Massachusetts, the company says.