Suspect: Marquiz Turner, pictured, has been charged with second-degree rape after allegedly raping his ex-girlfriend near a courthouse

A 19-year-old girl raped by her 16-year-old ex-boyfriend on the street in Rockville died on the way to a hospital for an examination - and her ex-boyfriend has been arrested.

According to authorities in Montgomery County, Maryland, Marquiz Turner is facing a second-degree rape charge over the alleged attack.

According to a court document, the girl and 16-year-old Turner met to see a movie together in Rockland.

The boy told police that he believed they agreed to have sex during the movie and was upset when his ex-girlfriend didn't want to.

Police said Turner acknowledged raping her on the street near the Montgomery County Circuit Courthouse, where sheriff's deputies saw them struggling and intervened.

According to ABC affiliate WJLA, deputies were told about the scuffle outside by a security guard for the courthouse, who saw 'a struggle' on security footage at about 11.40pm.

A court document said the girl was put in an ambulance but died on the way to hospital for unknown reasons.

WJLA reported she was declared dead at 1am on Friday.

The ABC affiliate station quoted court documents as saying '[Turner] was going to have intercourse regardless of [his date's] objections'.

Marquiz Turner is pictured here in photos taken from his Facebook account. He was said to have shown 'very little emotion' after learning his ex-girlfriend had died

Marquis Turner stands accused of raping his ex-girlfriend outside the Montgomery County Circuit Courthouse, pictured

Quoting court documents, CBS affiliate WUSA9 reported the girl earlier dated Turner for a month and broke it off since 'he was always pressuring her' for sex - and that Turner showed 'very little emotion' after learning the girl died.

WUSA9 wrote Thursday that 'Turner remains held in the Montgomery County Detention Center on $500,000 bond'.

A representative for the Montgomery County State's Attorney's Office, Ramon Korionoff, told WJLA: 'To say that this case is shocking would be an understatement.'