<PAGE>
--------------------------
OMB APPROVAL
UNITED STATES --------------------------
SECURITIES AND EXCHANGE COMMISSION OMB Number. 3235-0145
Washington. D.C. 20549 Expires: October 31, 1994
Estimated average burden
hours per response...14.90
--------------------------
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. 3 )*
-------
Lifeline Systems, Inc.
- --------------------------------------------------------------------------------
(Name of Issuer)
Common Stock, $.02 Par Value
- --------------------------------------------------------------------------------
(Title of Class of Securities)
532192 10 1
---------------------------------
(CUSIP Number)
Check the following box if a fee is being paid with this statement [_]. (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1: and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).
*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall be deemed to
be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934
("Act") or otherwise subject to the liabilities of that section of the Act but
shall be subject to all other provisions of the Act (however, see the Notes).
<PAGE>
- ----------------------- ---------------------
CUSIP NO. 532192 10 1 13G PAGE 2 OF 6 PAGES
------------ --- ---
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
L. Dennis Shapiro
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [X]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
United States
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF 639,099 (beneficial interest disclaimed in 4,124)
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
130,734 (beneficial interest disclaimed in 130,734)
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING 639,099 (beneficial interest disclaimed in 4,124)
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
130,734 (beneficial interest disclaimed in 130,734)
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
634,975
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
X
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
11.2
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
AMENDMENT NO. 3 TO SCHEDULE 13G
Item 1(a) Name of Issuer:
- -------------------------
Lifeline Systems, Inc.
Item 1(b) Address of Issuer's Principal Executive Offices:
- ----------------------------------------------------------
640 Memorial Drive
Cambridge, Massachusetts 02139
Item 2(a) Name of Person Filing:
- --------------------------------
L. Dennis Shapiro
Item 2(b) Address of Principal Business Office:
- -----------------------------------------------
24 Essex Road
Chestnut Hill, MA 02167
Item 2(c) Citizenship:
- ----------------------
United States
Item 2(d) Title of Class of Securities:
- ---------------------------------------
Common Stock, Par Value $.02
Item 2(e) Cusip Number:
- -----------------------
532192 10 1
Item 3: This Item is inapplicable.
- ------
Item 4 Ownership:
- --------------------
a. Amount Beneficially Owned as of December 31, 1993: 769,833
shares, except as this amount may be limited by the explanations
contained in paragraphs 2 through 6 below:
1. 634,975 shares are owned directly by Mr. Shapiro, which
includes 112,500 shares that Mr. Shapiro has the right to
acquire within sixty days after December 31, 1993.
2. 4,124 shares are in the name of Mr. Shapiro as custodian for
his children. Mr. Shapiro has
- 1 -
<PAGE>
sole voting and dispositive power over such shares, but he
disclaims any beneficial interest.
3. 17,062 shares are in the name of Mr. Shapiro's children. Mr.
Shapiro has shared voting and shared dispositive power over
such shares, but he disclaims any beneficial interest.
4. 12,360 shares are in the name of Mr. Shapiro's wife, as
custodian for their children. Mr. Shapiro has shared voting
and shared dispositive power over such shares, but he
disclaims any beneficial interest.
5. 66,000 shares are in the name of Mr. Shapiro's wife as a co-
trustee of three trusts. Mr. Shapiro has shared voting and
shared dispositive power over such shares, but he disclaims
any beneficial interest.
6. 35,312 shares are in the name of Mr. Shapiro's wife. Mr.
Shapiro has shared voting and shared dispositive power over
such shares, but he disclaims any beneficial interest.
b. Percent of class: 11.2.
c. Number of shares as to which such person has:
(i) sole power to vote or direct the vote: 639,099 shares
(which includes 112,500 shares which Mr. Shapiro has
the right to acquire within sixty days after December
31, 1993);
(ii) shared power to vote or direct the vote: 130,734
shares;
(iii) sole power to dispose of or to direct the disposition
of: 634,975 shares (which includes 112,500 shares which
Mr. Shapiro has the right to acquire within sixty days
after December 31, 1993); and
(iv) shared power to dispose of or to direct the disposition
of: 130,734 shares.
- 2 -
<PAGE>
Item 5 Ownership of Five Percent or Less of a Class:
- -------------------------------------------------------
This Item is inapplicable.
Item 6 Ownership of More than Five Percent on Behalf of Another Person:
- --------------------------------------------------------------------------
Mr. Shapiro holds 4,124 shares as custodian for his children. Mr.
Shapiro's wife holds 12,360 for their children. These children have
the right to receive any dividends which may be declared and any
proceeds from the sale of these securities.
Mr. Shapiro's wife holds 66,000 shares as a co-trustee of three
trusts. The trusts, in which Mr. Shapiro holds no interest, have the
right to receive any dividends which may be declared and any proceeds
from the sale of these securities.
Mr. Shapiro's children own 17,062 shares and have the right to
receive any dividends which may be declared and any proceeds from the
sale of these securities.
Mr. Shapiro's wife owns 35,312 shares and has the right to receive
any dividends which may be declared and any proceeds from the sale of
these securities.
Item 7 Identification and Classification of the Subsidiary Which Acquired
- -----------------------------------------------------------------------------
the Security Being Reported on by the Parent Holding Company:
------------------------------------------------------------
This Item is inapplicable.
Item 8 Identification and Classification of Members of the Group:
- --------------------------------------------------------------------
This Item is inapplicable.
Item 9 Notice of Dissolution of Group:
- -----------------------------------------
This Item is inapplicable.
Item 10 Certification:
- ------------------------
This Item is inapplicable.
- 3 -
<PAGE>
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
/s/ L. Dennis Shapiro
-----------------------
L. Dennis Shapiro
Dated: October 3 , 1994
---
- 4 -