The home of a Lexington couple charged with child abuse caught on fire as they appeared in court Monday morning. Fire investigators said the house on Irma Avenue caught on fire just before 8:30 a.m. Firefighters do not believe anyone was inside the house at the time of the fire. Fire investigators also do not know the cause of the fire at this time. Jamie Leigh Hiatt, 25, and Michael Patrick McKnight, 26 were both charged in October with felony child abuse after maggots were found in the diaper of an 18-month-old baby. The child was one of seven children in their care.