@sullyfish6,
(oops...truncated post..my fault)
They (his Dad and he) seemed to have a very strange relationship. In 1984, Marvin was fatally shot the night before his 45th birthday . His Dad (Marvin Sr.) shot him, 1984, while Marvin attempted to break up a fight (betw his Dad and Mom) over a lost business document . It was later revealed that Marvin and his Dad had been an early fist fight.
At some point perhaps during the murder trial, it was revealed that Marvin Sr. he had a brain tumor. Inconclusive how this may have affected his beahvior...but the resultant trial's legal outcome was manslaughter, as opposed to murder conviction.