Fort Worth, Texas ? A man was arrested and charged Tuesday with murdering his pregnant ex-girlfriend and her 7-year-old son, who disappeared from their home over the weekend.

Hours after the arrest, authorities found two bodies matching the description of bagel shop owner Lisa Underwood and her son, Jayden, authorities said.

Funeral home workers wheel a body from the brush where two bodies were found Tuesday in a shallow grave in a rural area near Northlake, Texas. Texas authorities say Stephen Barbee, who is charged with killing Lisa Underwood, his pregnant ex-girlfriend and her 7-year-old son, Jayden, has admitted suffocating both victims. Fort Worth Police Lt. Gene Jones says the bodies match the descriptions of the the missing woman and child.

Stephen Dale Barbee, 37, admitted arguing with Underwood over leaving his wife, according to court papers. Barbee allegedly said he suffocated Underwood, then did the same to the boy after he interrupted the attack.

Court papers said Barbee was the father of Underwood’s unborn child.

Barbee was arrested in Tyler, where he was clearing trees.

Barbee told investigators he put the bodies in the back of Underwood’s sport utility vehicle and dug a shallow grave. The SUV was found in a creek near the town of Denton on Monday.

Court papers also revealed that a sheriff’s deputy briefly had Barbee in custody early Saturday when he stopped a suspicious man covered in mud. The man ran into the woods and escaped.

Underwood, who was seven months pregnant, was reported missing Saturday along with her son after she failed to show up at her baby shower. A pool of blood was found in her Fort Worth home, but there was no sign of forced entry, police said.

Underwood and Barbee met about two years ago but split up last fall because Barbee had another girlfriend, said Debbie Lindley, a neighbor of Underwood’s.