DS Peter Livingstone (Neil Duncan) was a sidekick police detective of Jim Taggart's who first appeared in Killer and was originally from Edinburgh. Jim didn't get on well with him at first, because he was a well educated graduate who was not local, but as the cases moved on they seemed to get on better. Peter left in 1987 to start his own security business following the arrival of Michael Jardine who he didn't get on well with either. The pair always seemed to be trying to give each other a hard time. He then appeared again in 1994 in Forbidden Fruit to ask Jim and Jean to be godparents to his son. After the christening he was never seen again. His son is called Xavier. But then it was revealed that in Forbidden Fruit, that Xavier is actually the son of Doctor Colin Miller and one of sixty