Is it possible to trace the system, who has modified the script(stored procedure) recently in SQL server?

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SQL-Server-2008R2

Hi,
I had a stored procedure with set of codes. But suddenly some one has changed some code in the Proc and has altered the script. I dont know who has done it or from which system the procedure is been modified. Only I can see is last modified date and time. Is there any possible way to trace the system from where the script has been modified.? Please help.

Thanks in advance.

What I have tried:

SELECT name n1 , create_date n2 , modify_date n3,* FROM sys.procedures
order by modify_date desc;
It only has date modified not the user or system.