TIJUANA, MX. (THECOUNT) — According to Tuesday reports, a fifth body has been discovered at a Tijuana home where the bodies of Garden Grove couple, Jesus Guillen and Maria Lopez were found.

Guillen, 70, and his 65-year-old wife, traveled to Tijuana on Jan. 10 to collect rent from their tenants, and were never heard from since. Their bodies were found last Friday, buried in mud at one of their properties.

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A second set of bodies – also male and female – were discovered late Saturday in a state of advanced decomposition. The discovery of a fifth body was announced by Mexican authorities Monday, reports CBSLosAngeles.

Their son-in-law, identified by Mexican authorities only as Santiago N., has been arrested in their murder. The 36-year-old man had previously been deported from the United States in 2012.

Mexican authorities say he had been collecting rent for apartments they owned in the city on their behalf, and they suspect he killed them in a dispute over money. Investigators also said they believe the suspect wanted to stage a kidnapping in order to collect ransom.

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Geo quick facts: Tijuana is a border city in Mexico, just south of California. Its bustling main street, Avenida Revolución, is lined with souvenir shops and lively bars. Landmarks include the neoclassical Jai Alai Frontón palace and Centro Cultural Tijuana, a modern cultural complex in the Zona Río district. Throughout town, stadiums stage lucha libre (wrestling) matches, while the nearby city of Rosarito fronts sandy beaches – wikipedia.