Originally he was Prue's boyfriend at high school, but they broke up when they went to college. But when he returned to San Francisco for his job as an inspector at the San Francisco Police Department (he did the homicides cases, together with his partner Darryl Morris), he accidentally bumped into Prue again. Prue had just received her powers back then. They decided to give their relationship another chance.
Although Prue and Andy did their best to have a normal relationship, Prue occasional sudden disappearances, due to warlocks and demons, started to annoy Andy. Especially when Prue could never really explain why she had to go. Coincidentally (was it?) Andy got assigned to almost every single case that involved the sisters. This didn't really help Andy's suspicions.
When Prue cast a truth spell, to see if Andy got accept her big secret, she found out Andy could not. Prue broke up completely with Andy after this. Eventually, Andy did find out the sisters' secret, but this didn't help their relationship. when he realized how many lives they saved, he put his career on risk by protecting the sisters'. When he the Police Internal Affairs began questioning him about all his unsolved cases. Eventually, he even gave his life to protect the Prue's and her sisters', when a demon, disguised as IA investigator, tried to kill them.
Andy Facts Full Name: Andy Trudeau Jobs: Inspector at the San Francisco Police Department Relationships: Susan; marriage, Prue; dating