(Tigard, OR)  --  An investigation is ongoing into the death of a man who was found dead inside his Tigard home following a fire there.  Firefighters responded to the house off Southwest 109th Avenue yesterday to find the home engulfed in flames.  Crews found the man's body inside the home's kitchen.  Fire officials say it's not yet clear if the man died before or during the fire.  Investigators are still looking into how the blaze started.