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EAST NAPLES (CBSMiami/AP) — A man is behind bars for a reason that would baffle many.

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The 30-year-old southwest Florida man is accused of killing his mother inside the mobile home they shared.

Collier County Sheriff’s investigators said in a news release that Yuzo Nishi was booked into jail early Monday on a second-degree murder charges.

An arrest report says deputies found 51-year-old Maria Bertalmio dead Sunday night when they responded to a medical call at the home in Sunny Acres Mobile Village in East Naples. Deputies say the woman was in the living room.

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Investigators say her son caused her death.

The cause of death hasn’t been released.

Reports don’t indicate whether Nishi has retained a lawyer.

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