Maurice Jewel Taylor Sr. was arraigned at Antelope Valley Courthouse Monday
He was charged with killing son Maurice, 12, and daughter Maliaka, 13, on November 29 in Lancaster; prosecutors said it was days before they were found
His two younger children were shown their siblings’ bodies, prosecutors said
Taylor faces two felony counts each of murder and child abuse under circumstances or conditions likely to cause great bodily injury or death
On Monday he told the court police and other inmates were trying to kill him and said he was an educated fitness trainer which is equal to being a doctor
He is said to have refused an attorney and told the judge he was not guilty