All four bodies were covered in lime when found, investigators said.
Jesus Ruben Lopez Guillen, 70, and his wife, Maria Teresa Lopez, 65, of Garden Grove, Calif., a couple with dual US-Mexico citizenship, vanished Jan. 10 after they crossed the border to collect more than $6,700 in rent from tenants of two houses they owned in Tijuana.
Their bodies turned up in one of the houses, the San Diego Union-Tribune reported, citing Mexican investigators.
The suspect, known as Santiago N., 36, had a criminal record in the US, and was deported in 2012.
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