When the dispatcher asked him why he did it, the man said, "It's a holy day," according to Richland Hills police.
Investigators also believe the father took his son's blood and smeared it on the sides and the top of the home's door frame -- much like in the Passover described in the Old Testament of the Bible.
Police arrested the father, Brent Troy Bartel, 39, (shown here) early Wednesday at his house in the 3700 block of Ruth Road.
A lot of Star-Telegram staffers are working on this story. See their work here.