A Port Richmond man has been arrested and charged with the murder of the pregnant Staten Island woman whose body was found partially nude in a park last week, police said.

Pedro Martin, 27, was charged this morning in the death of Megan Marotte, 20, who was reported missing after disappearing Aug. 7. Her body was found eight days later in Willowbrook Park. She was naked from the waist down, sources said.

Investigators believe that the suspect and victim had just met at an area business and agreed to exchange sex for cash, sources said. The victim has no prostitution history but was arrested recently for driving under the influence of drugs, sources added.

kconley@nypost.com