(CNN) A West Virginia man is accused of murdering his girlfriend's 15-year-old daughter, law enforcement said.

Andy J. McCauley Jr. was arrested and charged in Riley Crossman's murder, the Morgan County Sheriff's Department said.

Riley has been missing since May 8, when her mother learned she did not attend school, the sheriff's department said in a statement.

McCauley has been a "person of interest since day one," Morgan County Sheriff K.C. Bohrer said in a news conference Thursday.

Authorities believe they found Riley's body Thursday morning, pending confirmation through an autopsy.

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