How did he find it!!!

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This is very puzzling for me :roll : help me please if you could... thank you
A house the owner died, no wife, no children. His family did a Estate sale, no ad in the paper,CL or anywhere else,that same day an agent from a 10 miles away WAS WALKING BY and solicit his service and got it listed. No they dont know him and never met him before.how did he find it so quick, so fast? Death notices?...
Is there anyway of finding homeowners who are prepairing to sell other than thru RE agent?
Plz give some suggegtions
Thank you