Police in Philadelphia are looking for a 58-year-old man who allegedly hid his mother’s body in a freezer after her death for months while taking advantage of her Social Security benefits, WPVI-TV reported on Tuesday.

A vehicle belonging to William Carrasquillo was towed away from the residence he shared with his mother, identified as 83-year-old Andrea Carrasquillo. Authorities also seized the freezer containing her body. The cause of her death has not been determined.

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Besides his car, Carrasquillo’s personal belongings were also found at the residence. Both WPVI and WCAU-TV cited unnamed sources in reporting that Carrasquillo allegedly collected his mother’s Social Security checks while keeping the body hidden.

KYW-TV reported that William Carrasquillo’s mother-in-law, Tia Ramos, told police she believed the body had been kept in the freezer since January, based on a phone call with her daughter.

“She said that her daughter, Cynthia, received a phone call from William saying that he did a big mistake, he did something really bad,” said Vanessa Feistevole, a neighbor who acted as a translator during Ramos’ statement to police. “The daughter questioned him and said, ‘What did you do?’ And he said, ‘My mother fell, and she died instantly. And I put her in the freezer in the basement.'”

Watch WPVI’s report, as aired on Tuesday, below.