Police say the man who allegedly stabbed a young mother to death inside a Massachusetts apartment complex Monday may be in the country illegally, MyFoxBoston.com reports.

Marcela Almeida, 41, was arrested for allegedly stabbing 24-year-old Patricia Frois during a domestic dispute inside their apartment in Marshfield.

Almeida reportedly fled the crime scene, sparking a massive manhunt and causing at least three area schools to go on lockdown.

Authorities later found Almeida hiding in a backyard shed not far from the crime scene, according to the website.

Almeida's citizenship status is now under investigation by U.S. Immigration and Customs Enforcement. Police say the man has a Brazilian passport and that immigration officials have no record of anyone under his name having entered the country legally.

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Marshfield murder suspect's immigration status in question: MyFoxBOSTON.com