I have not been able to find an obituary for Pete Steres. Gary Williams provided a link to a remembrance message thread on a rock climbing web site, which has the date of Peter Steres death: "Pete Steres died on February 11, 2007 at the age of 54."

Here is that link: Pete Steres, R.I.P.

In addition, I found another series of comments at the same website: Pete Steres, R.I.P. (2)

And lastly, I found a fairly lengthy article by Tracy Slaughter on Climbing Magazine's web site:

2007 - Boulder Climber Peter Steres Dies at 54

Garrett

P.S. Here is a picture from 2000 sent by Gary Williams: