FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Rosebrough Walter M Jr   2. Issuer Name and Ticker or Trading Symbol STERIS CORP [STE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) President & CEO (Last) (First) (Middle) 5960 HEISLEY ROAD 3. Date of Earliest Transaction (Month/Day/Year) 10/01/2010 (Street) MENTOR, OH 44060 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Shares, No Par Value 10/01/2010   S(1)   2,600 D $ 33.2401 109,400 D   Common Shares, No Par Value 10/01/2010   S(2)   9,000 D $ 33.0373 100,400 D   Common Shares, No Par Value 10/01/2010   M(3)   11,000 A $ 33.43 111,400 D   Common Shares, No Par Value 10/01/2010   M(4)   12,000 A $ 33.43 123,400 (5) D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Conversion of Restricted Stock Units

(6)

10/01/2010

M

11,000

(7)

(7)

Common Shares, No Par Value

11,000

$ 0

0

D

Conversion of Restricted Stock Units

(6)

10/01/2010

M

12,000

(8)

(8)

Common Shares, No Par Value

12,000

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Rosebrough Walter M Jr 5960 HEISLEY ROAD MENTOR, OH 44060	X		President & CEO

Signatures

Dennis P. Patton, Authorized Representative under Power of Attorney		10/01/2010
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	This open market sale of a total of 2,600 Common Shares is for the purpose of providing for the taxes payable upon the vesting of 23,000 restricted stock units and is made pursuant to a Rule 10b5-1 Stock Trading Plan entered into by the Reporting Person on May 9, 2010.
(2)	This open market sale of a total of 9,000 Common Shares is for the purpose of providing for the taxes payable upon the vesting of 23,000 restricted stock units and is made pursuant to a Rule 10b5-1 Stock Trading Plan entered into by the Reporting Person on May 9, 2010.
(3)	This acquisition of 11,000 Common Shares represents the vesting on October 1, 2010 of 11,000 Restricted Stock Units granted pursuant to an agreement effective October 15, 2007.
(4)	This acquisition of 12,000 Common Shares represents the vesting on October 1, 2010 of 12,000 Restricted Stock Units granted pursuant to an agreement effective October 15, 2007.
(5)	83,000 of these Common Shares are restricted. The restrictions on these Common Shares lapse as follows: 24,000 on May 23, 2011, 24,000 on May 21, 2012 and 35,000 on May 20, 2014.
(6)	Each Restricted Stock Unit represents a contingent right to receive one STERIS Common Share.
(7)	These Restricted Stock Units vested on October 1, 2010. The 11,000 vested Common Shares will be delivered to the reporting person promptly.
(8)	These Restricted Stock Units vested on October 1, 2010. The 12,000 vested Common Shares will be delivered to the reporting person promptly.

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