Family members found Ramirez-Diaz on the garage floor of the home in the 13000 block of Fairview Avenue around 4:30 p.m. on Friday.
Police said she had suffered significant injuries and was pronounced dead at the scene.
Salazar was taken to the police station for questioning before he was arrested.
The two were apparently involved in a prior relationship and have a child together.
Salazar is being held on $1 million bail.
City News Service contributed to this report.