<PAGE>
ITT HARTFORD LIFE AND ANNUITY INSURANCE COMPANY
ICMG REGISTERED VARIABLE LIFE SEPARATE ACCOUNT ONE
SUPPLEMENT DATED JUNE 19, 1997 TO THE ENDEAVOUR I GROUP FLEXIBLE PREMIUM
VARIABLE LIFE INSURANCE POLICIES WITH RESPECT TO THE ICMG REGISTERED VARIABLE
LIFE SEPARATE ACCOUNT ONE PROSPECTUS DATED MAY 1, 1997.
The last paragraph of the section, "Summary -- Deductions and Charges from the
Investment Value" is deleted and the following language is substituted:
A charge is made for mortality and expense risks assumed by Hartford.
Hartford currently deducts a daily charge for Coverage Years one through ten at
an effective annual rate of .65% of the value of each Investment Division's
assets and for Coverage Years eleven and later at an effective annual rate of
.50% of each Investment Division's assets. In no event will the charge exceed
.65% of an Investment Division's assets on an annual basis.
The section, "Detailed Description of Certificate Benefits and Provisions --
Loans -- Credited Interest" is deleted and the following language is
substituted:
Amounts in the Loan Account for Coverage Years one through ten will be
credited with interest at a rate equal to the Adjustable Loan Interest Rate then
in effect, minus 1%. Amounts in the Loan Account for Coverage Years eleven and
later will be credited with interest at a rate equal to the Adjustable Loan
Interest Rate then in effect, minus .20%
The first paragraph of the section, "Detailed Description of Certificate
Benefits and Provisions -- Mortality and Expense Risk Charge" is deleted and the
following language is substituted:
A charge is made for mortality and expense risks assumed by Hartford.
Hartford currently deducts a daily charge for Coverage Years one through ten at
an effective annual rate of .65% of the value of each Investment Division's
assets and for Coverage Years eleven and later at an effective annual rate of
.50% of each Investment Division's assets. In no event will the charge exceed
.65% of an Investment Division's assets on an annual basis. See also, "Premiums
- -- Accumulation Unit Values".
HV-2147
