Police said Colbert, from New Castle, which is about 50 miles west of Kittanning, is also wanted by other law enforcement agencies.
They said Colbert, who is 6'3 and has a tattoo on his forearm that says "loyalty," used to date Stoner.
Stoner was wearing a yellow North Face hooded sweatshirt, grey plaid Vans shoes and a black coat with a brown fur hood when she disappeared, police said. She has a cut on her left eye, burn marks on her wrists and a tattoo on her ankle that says "Daddy's little girl."
Kittanning police are asking for anyone with information on the whereabouts of either Colbert or Stoner to contact them.
Elisha Fieldstadt is a breaking news reporter for NBC News.