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MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
1295 State Street
Springfield, Massachusetts 01111-0001
May 6, 1999
VIA EDGAR
Securities and Exchange Commission
Judiciary Plaza
450 5th Street, NW
Washington, DC 20549
RE: MML Series Investment Fund (the "Trust") (file nos. 2-39334 and 811-
2224); Prospectuses
Dear Sir or Madam:
Pursuant to Rule 497 (j) under the Securities Act of 1933, as amended, please
accept this letter as certification that the prospectus and statement of
additional information for the Trust does not differ from that contained in
Post-Effective Amendment No.42 to the Trust's registration statement under the
Securities Act of 1933 and Amendment No. 27 to the Trust's registration
statement under the Investment Company Act of 1940 on Form N-1A (the
"Amendment"). This Amendment was filed electronically on April 29, 1999. Please
note that the Trust will also be using other forms of prospectuses, filed via
EDGAR pursuant to Rule 497(c).
If you have any questions concerning the foregoing, please call the undersigned
at (413) 744-8442.
Very truly yours,
/s/ Jaqueline M. Hummel
Jaqueline M. Hummel
Counsel
