Going through boxes of documents they'd confiscated, police found paperwork that indicated Ali Irsan was committing multiple acts of fraud, such as falsely claiming disability benefits and opening credit cards in his kids' names.

So the Harris County Sheriff's Department brought in the FBI, and ultimately a task force that came to include the Montgomery and Harris County sheriff offices, the FBI, the Houston Police Department, the Social Security Administration Office and Homeland Security got to work.

According to authorities, Irsan, a naturalized citizen, had first come to the U.S. from Jordan in 1978 and proceeded to marry a blind woman whom he physically and sexually abused, and had four children with. While still married, he brought a teenage bride, Shmou, over from Jordan, and they had eight more children, including Nesreen and Nadia.

In 2014, Irsan was charged in federal court with conspiracy to defraud the United States, theft of public money and benefits fraud, and Shmou and Nadia were arrested, too. In April 2015, he pleaded guilty to conspiracy to defraud and was sentenced to 45 months in prison; his wife and daughter were convicted of providing false statements as part of the fraud scheme and were each sentenced to two years in prison.

But back to the double murder investigation.

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