CANCUN, Mexico (AP) — A TV producer's correspondence with his wife, who was found dead at a Mexican resort, indicated problems in their marriage, a prosecutor said Wednesday.

Rodolfo Garcia Pliego, the assistant attorney general of the Caribbean coast state of Quintana Roo, said the mother and sisters of victim Monica Beresford-Redman showed him "a series of exchanges" between the woman and her husband, Bruce Beresford-Redman.

"Excuse me for not releasing the contents of the documents, which showed the state of the relationship," he told reporters after meeting with the family. "It appears there were problems there."

State prosecutors say Beresford-Redman, a former producer of "Survivor" and co-creator of the "Pimp My Ride" show, is a suspect in the slaying of his wife. Her body was discovered April 8 in a sewer at the Moon Palace Resort in Cancun two days after the producer said she had failed to return from a shopping trip.

The victim's sister Jeane Burgos told reporters after the meeting that "we have delivered more evidence."

"We are happy with the work authorities are doing to get justice for my sister," Burgos said.

Her mother, Ely Burgos, said: "The killer is in Cancun. Be careful, he is among you. He is cold and cruel." She did not use a name.

Garcia Pliego said he has requested that the woman's remains be turned over to her relatives, noting the husband has not asked for the body. Forensics experts have been carrying out tests on the remains.

The victim's sisters said the marriage was crumbling as a result of a long-term affair that Beresford-Redman was having with another woman and that she had gone on the trip to Mexico in an attempt to save her marriage.

Beresford-Redman has not publicly commented on those reports. He has been barred from leaving Mexico until the investigation is complete.