PROSPECTUS SUPPLEMENT

SECURITY LIFE OF DENVER INSURANCE COMPANY

and its

Security Life Separate Account L1

Security Life Separate Account S-L1

Supplement dated March 21, 2007, to your prospectus dated April 28, 2006. Please read it carefully and keep it with your prospectus for future reference.

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IMPORTANT INFORMATION ABOUT THE ING MARKETPRO PORTFOLIO

Effective April 30, 2007, we are closing to new investors and to new investments by existing investors the subaccount which invests in the following fund:

· ING MarketPro Portfolio (Class I)

Policy owners who have policy value allocated to the subaccount that corresponds to this fund may leave their policy value in that subaccount, but future allocations and transfers into that subaccount are prohibited. If your most recent premium allocation instructions includes a subaccount that corresponds to this fund, premium received after April 30, 2007, that would have been allocated to that subaccount will be allocated on a pro rata basis among all the other available subaccounts in which your policy value is allocated. If there are no other such subaccounts, you must provide us with alternative allocation instructions or the premium payment will be returned to you. Your failure to provide us with alternative allocation instructions and our return of any premium payment may result in your policy entering the 61 day grace period and/or your policy lapsing without value.

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