Hi - I am descended from Newell Carroll and Nancy Irby through the line of one of their son's Robert Monroe Carroll.
Through this search, I came across another descendent, Joanna White, who informed me that Newell Carroll was Newell Walton (not B) Carroll b. April 4, 1813 in GA and married to Nancy Irby from TN. They followed their son, Robert Monroe Carroll to Erath County/Dublin, Texas and died there.
According to her information, Newell Carroll died October 5, 1890 and Nancy Irby Carroll died December 11, 1912. They are both buried in the Barbee Cemetery in Erath County, TX.
I hope this helps. You may want to read her web searches that are near yours. She is very helpful. Thx. Ginie