Character from nowhere

Okay, I just had a character show up, who has apparently been a part of the story for a while. Weird.

Maddy and Michael slept in until ten o clock in the morning, when they heard a loud banging on the door.

“Hey, you guys in there?” it was Stretch, Michael's cop friend from Boston who has not been in the book until just now, but we are going to pretend that he has.