the fbi has joined the search for a man charged with beating his wife to death with a knife inside the fast-food chain .
bhadreshkumar chetanbhai patel , 24 , faces a federal charge of fleeing to avoid prosecution and the fbi announced on wednesday that a federal criminal complaint said that patel was last seen at a hotel near newark international airport shortly after his wife was killed on april 12 .
he reportedly has his india-issued passport with him .