Nearly six years after friends Libby German and Abby Williams were killed on an Indiana hiking trail, police finally have a suspect in custody. Richard Allen was arrested and booked into the Carroll County Jail Friday, multiple law enforcement sources told FOX59. While authorities have not yet confirmed his arrest, they said in a news release they would announce an update on the case Monday morning. German’s sister Kelsi tweeted Friday, “Just know how grateful I am for all of you.” “No comments for now, any questions please refer to the Carroll county prosecutors office,” she added. “Today is …