A boyfriend of a woman found dead in a shipping container Monday in Reseda were living together in the metal structure before he was arrested on suspicion of murder, authorities said Tuesday.

Marcelino Delossantos, 51, of Reseda was arrested in connection with the murder on Monday, said Los Angeles Police Department Operations Valley Bureau homicide Detective John Doerbecker.

“He’s essentially confessed to the domestic violence incident,” Doerbecker said.

The boyfriend was detained for questioning after the woman was found dead around 11:30 a.m. in the container behind a home on the 19000 block of Keswick Street, said LAPD Officer Mike Lopez.

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Doerbecker said the murder appeared to have happened within 24 hours of the LAPD finding her body.

“One of the neighbors witnessed him muttering to himself about the incident and called,” Doerbecker said.

The detective declined to give the exact wording so as not to misconstrue the statement.

The couple lived in a “big, metal storage container” for approximately three years, Doerbecker said.

“That was their home,” Doerbecker said. There was no evidence of prior domestic violence between the two “at this point,” the detective said.

According to L.A. County Sheriff’s Department booking records, Delossantos is being held at Van Nuys Jail in lieu of $2 million bail. He was arrested at 2 p.m. Monday, according to the records.