John Courtock, 20, of the 1300 block of Leavitt Road, was arrested about 2:30 p.m. Tuesday after his girlfriend, Tiffany Kunc, 22, sought police.
Kunc, who is five months pregnant, told police the couple was arguing and she walked away to take a shower. She said Courtrock followed her, pushed her down and began hitting her, according to a police report.
She told police she escaped and called police. Dispatchers noted in the report that while she was on the phone with them, they could hear a man threatening to kill her and her children.
Courtock was held at the Lorain City Jail. He has a court appearance March 14 in Lorain Municipal Court.