One day, Mason Huber met a woman named Martha Tillman and they started to date. Edie says that Mason proposed to Martha at Torch Lake where she excepted it and they got married but did not have children. ("Every Day a Little Death") Mason and Martha moved to Wisteria Lane in the late 80's. He died before the summer of 1990 due to a heart attack and he left Martha with a "worthless pension". ("Guilty"/"Finishing the Hat")
After the death of Martha, her sister Felicia is looking through family photo albums of Matha and Mason and if you look closly at one of the pictures it says "Mason" on it revealing Martha's late husband's name. ("Love is in the Air")
Mason's name is never revealed in the series but it is seen on the back of one of Martha's pictures.
Mason was not the smartest man out there as the pension he left Martha was "worthless".
Mason and Martha's marriage might not have been a happy one because Martha gives the hint that she does not care that her husband is dead.
Mason proposed to Martha at Torch Lake.
There are rumors that Mason died because Martha killed him for leaving her a worthless pension.