Prosecutors say lawyers for a reality TV producer accused of murdering his wife in Mexico have filed a legal challenge there to try to block his extradition. Mexico has requested Bruce Beresford-Redman's extradition from the United States. The appeal asks a higher court to consider whether the underlying arrest warrant is valid. Quintana Roo state prosecutor Rodolfo Garcia says the petition arrived Friday. Beresford-Redman is charged with killing his wife, Monica, who was found in a sewer of a Cancun resort in April. The former “Survivor” producer denies the charges. His lawyers said Thursday that he would surrender to US authorities if necessary, but he intends to fight extradition.