(Hillsboro, OR)  --  A man is facing murder charges after stabbing his mom's boyfriend.  Police say Thomas Wearing was suffering from a stab wound to the abdomen when they responded to an assault call.  He died at a hospital later.  Wearing lived with his girlfriend and her 20-year-old son Timothy Simpkins who fought with the man Monday night.  Simpkins allegedly stabbed Wearing during the argument and was booked into the Washington County Jail.