Courtesy: Carla Burgos/Family Photo

New details have emerged about Bruce Beresford-Redman's last few weeks with his wife, Monica Beresford-Redman ... before her body was found in the sewage tank of their Mexican hotel on April 8.

In a new complaint seeking the arrest and extradition of the former Survivor producer, it has been revealed that Monica had learned her husband was having an affair six weeks before her death. Also in the docs ... the fact that while on their trip to Cancun, Mexico, the two argued about the affair because she found evidence that Bruce was still in contact with his mistress.

Other details in the papers ... the fact that two English teenagers in the room below the couple heard "screams, crying for help and extremely loud banging from the room above ... It sounded like a woman in extreme distress."

Beresford-Redman had instructed the hotel stuff not to enter their room on April 5, according to the complaint. Also, when a friend spoke to him on April 7, the friend said it sounded like the former Survivor producer was reading from a script.

According to the autopsy of Monica Beresford-Redman's body, she died by asphyxia by suffocation, and there was also evidence of a blunt head wound and bruising on her face.

Beresford-Redman was taken into custody yesterday and is expected in court next Wednesday.