|Appearances||The Lost and Damned|
|Place of Birth||Puerto Rico|
|Home||Elizabeta's apartment, Bohan, Liberty City|
|Voiced by||Honey Rockwell|
Before the events of The Lost and Damned, Marta had met Elizabeta on a "very hot night" in Puerto Rico. According to Marta, the two only had sex but never had a serious relationship.
Marta's first appearance is in the mission Marta Full of Grace where Elizabeta sends Johnny Klebitz to pick up Marta from Francis International Airport in Dukes. Marta had arrived in the city with a large amount of cocaine smuggled inside her body. As Johnny arrives at the airport, a FIB agent discovers what Marta is carrying and attempt to detain her, apparently to force her to give him oral sex. After a shootout with the police, Johnny rescues Marta and takes her to Elizabeta's apartment.
She is again seen in the mission Shifting Weight, cooking in Elizabeta's kitchen. She offers Johnny some food, which he accepts, but doesn't get a chance to eat with Malc cutting in and stating the two need to leave.
- Marta implies that she is a fan of the Liberty City Swingers baseball team, or minimally has knowledge of the team.
- Marta is poorly proficient in the English language, and as a result uses Spanish for much of her appearance, creating a language barrier that leaves Johnny largely clueless of her thoughts. Much like the Serbian used by Niko Bellic and his Serbian acquaintances, the game translates Marta's Spanish into English via subtitles if it is enabled.
- It is suggested that Johnny has feelings for Marta as he will ask to take her out and show her around the city in Marta Full of Grace. Johnny also seems to be worried about her safety in Shifting Weight.