"Did Donny send you?! Boy, isn't enough for me to go into this stupid house, he has to send someone to try and scare me, too?! Who does he think I am?! I'm good enough for his gang! Who should I go take pictures of zombies in some..."
Jo-Beth Casey to Cortez.

Donny is an unseen character that Jo-Beth Casey mentions in the first Mansion Of Madness cutscene. He owns a gang that Jo-Beth Casey is trying to join, and the only way he'd let her in is by having her go take pictures of zombies from the apparent haunted mansion. She assumes Donny sent Cortez there to try to scare her at first before realizing Cortez wasn't from around the area.