Exhibit 1.A(8)(b)(v) FOURTH AMENDMENT TO PARTICIPATION AGREEMENT THIS AGREEMENT is made by and among Security Life of Denver Insurance Company, a life insurance company organized under the laws of the State of Colorado ("Insurance Company"), INVESCO...

                                                            Exhibit 1.A(8)(b)(v)

                   FOURTH AMENDMENT TO PARTICIPATION AGREEMENT

         THIS AGREEMENT is made by and among Security Life of Denver Insurance
Company, a life insurance company organized under the laws of the State of
Colorado ("Insurance Company"), INVESCO Variable Investment Funds, Inc., a
Maryland corporation (the "Company"), and INVESCO Funds Group, Inc., a Delaware
corporation ("INVESCO") (collectively, the "Parties).

         WHEREAS, the Parties executed a participation agreement dated August
26, 1994 (the "Participation Agreement"), governing how shares of the Company's
portfolios are to be made available to certain variable life insurance and/or
variable annuity contracts (the "Contracts") offered by the Insurance Company
through certain separate accounts (the "Separate Accounts");

         WHEREAS, the various Contracts for which shares are purchased are
listed in Schedule B of the Participation Agreement;

         WHEREAS, the Parties have agreed that it is in their interests to add
an additional Contract funded by the Separate Accounts;

         NOW THEREFORE, in consideration of their mutual promises, the Insurance
Company, the Company and INVESCO agree as follows:

1.  The Participation Agreement is hereby amended by substituting for the
original Schedule B an amended Schedule B in the form attached hereto which adds
the Corporate Benefits Variable Universal Life Policy to the list of Contracts
funded by the Separate Accounts.

Executed this 3rd day of November, 1999.

ATTEST:                            INVESCO Variable Investment Funds, Inc.


                                   BY:      /s/ Xxxxxx X. Xxxxxx
                                            Xxxxxx X. Xxxxxx
                                            Senior Vice President

ATTEST:                            Security Life of Denver Insurance Company


                                   BY:      /s/ Xxxx X. Xxxxxxxx

ATTEST:                            INVESCO Funds Group, Inc.


                                   BY:      /s/ Xxxxxx X. Xxxxxx
                                            Xxxxxx X. Xxxxxx
                                            Senior Vice President

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                                   SCHEDULE B

                                    Contracts



                                                           
1.  The Exchequer Variable Annuity                            (Flexible Premium Deferred Combination Fixed and
                                                              Variable Annuity Contract)

2.  FirstLine                                                 (Flexible Premium Variable Life Insurance Policy)

3.  Strategic Advantage Variable Universal Life               (Flexible Premium Variable  Universal Life Insurance
                                                              Policy)

4.  FirstLine II Variable Universal Life                      (Flexible Premium Variable Universal Life Insurance
                                                              Policy)

5.  Strategic Advantage II Variable Universal Life            (Flexible Premium Variable Universal Life Insurance
                                                              Policy)

6.  Variable Survivorship Universal Life                      (Flexible Premium Variable Universal Life Insurance
                                                              Policy)

7.  Corporate Benefits Variable Universal Life                (Flexible Premium Variable Universal Life Insurance
                                                              Policy)



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