[CentOS] /proc process information on centos 4.1

Is there a way to tell through /proc or something else which
files a process has open and more importantly what position the read
pointer is in for that open file?

As an example if I am reading a file with a program I have no control over,
and I kill that program, I need to know when in the data file that 
program was
reading at that time.

Is this information available and if so how to read it?

Thanks,

Jerry