Father Accused of Kidnapping 8-Month-Old Daughter and Killing Baby's Mother: Authorities

Am Amber Alert had been issued for the baby girl after her mother was found dead, police said.

A Pennsylvania man has been charged with murder and kidnapping for allegedly abducting his 8-month-old daughter after killing the baby’s mother on New Year's Eve, police said.

Antonio Velazquez-Rupert, 36, was arrested Saturday afternoon, about 38 minutes after an Amber Alert was issued, according to Mercer County officials.

Read: Amber Alert Issued for 4-Year-Old Who Disappeared From Her Bed, Later Spotted at Gas Station

He is being held without bail at Berks County Jail pending an extradition hearing to Mercer County, according to authorities and online booking records. He also faces one count of interfering in child custody.

The body of Amanda Downs, 28, was found Saturday at about noon in her bed. She suffered a traumatic head injury, Mercer County District Attorney Miles Karson Jr., told the Meadville Tribune reported Monday.

Read: Dad Kills Two Young Sons and Then Turns Gun on Himself During Amber Alert: Cops

An Amber Alert was issued at about 3 p.m. and listed Velazquez-Rupert and his Black Ford Explorer, authorities said.

An alert citizen spotted the vehicle some 300 miles away in Reading and phoned 911, The Associated Press reported.

A family friend told WKBN-TV that Velazquez-Rupert was a former boyfriend of Downs and she had been trying to “co-parent” the baby with him.

Watch: 10-Year-Old Girl Found Dead, Uncle Charged with Murder After Amber Alert Issued