Tim's Father

Tim's Father was a posthumous villain appearing in Touched By An Angel, seen via a flashback he is the reason why Tim fell into darkness and became a pawn for Satan in later life - due to the Biblical nature of the show and Tess' own words in the episode it is strongly suggested Tim's Father was himself influenced by Satan and thus was in many ways as much a pawn as his son would become to the Lord of Darkness and it is possible the events were played out in order to shape Tim into what the Devil's desired (though it would ultimately fail).

Tim's Father was a cruel figure who abused his son on a regular basis, locking the young boy in darkness despite his fear of said dark - Tess acted as a caretaker at the time but was disliked by Tim's Father, who demanded she leave his property, as an angel (even in disguise) Tess had to obey Tim's Father and thus left but comforted a young Tim by helping the frightened child turn on a light he had been desperately trying to reach and manifested in her true angelic form to try and tell Tim he had a bright future and that God would always love him but that she sadly had to leave.

Tim didn't want Tess to leave but the angel had no choice and left with kind words, which were broken when Tim's Father entered the room - Tess had vanished and it was implied Tim's Father proceeded to beat him afterwards.

It is unknown how or when Tim's Father passed on but his abuse of Tim shaped the once loving boy into a troubled man whose gifts of leadership grew xenophobic and dangerous, further manipulated by Satan Tim would almost spark a minor race war and even opposed his former guardian Tess until she, Monica and Sam worked together to finally defeat Satan, during the battle Tess informed Tim he had been taking orders from men like Satan his own life and urged Tim not to let the Devil or his father harm him any longer.. Tim finally broke and asked God to remove the Devil, which He promptly did and despite Satan's claim things were not over Tim's life likely greatly improved as he finally confronted his dark past and learned to better himself.