SAN DIEGO (CBS) — A third suspect has been arraigned in the investigation into the murder of a Marine wife whose body was found dumped in Riverside County.

KNX 1070′s Tom Reopelle reports Dorothy Grace Marie Maraglino has pleaded not guilty to charges of aiding and abetting in the murder of Brittany Kilgore.

Prosecutor Patrick Espinoza said Maraglino, 36, persuaded Kilgore to join Staff Sergeant Louis Ray Perez on a dinner cruise on April.

Shortly after she was picked up by Perez, Espinoza said Kilgore realized she was in trouble.

“Brittany sent a text message in distress asking for help shortly after the point in time when Mr. Perez was with her,” said Espinoza.

Perez, 45, was the last person to see Kilgore alive before the night of her disappearance on April 13. He pleaded not guilty last month to murder charges and remains in custody.

Prosecutors believe Kilgore was murdered by Perez and another suspect, Jessica Lopez, at Maraglino’s home in Fallbrook. Her body was found on April 17 near Lake Skinner in Riverside County.

Kilgore had reportedly filed for divorce from her husband, a Marine serving in Afghanistan, just three days before her disappearance.

Maraglino is being held along with Perez and Lopez on $3 million bail.