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She was seen leaving a Texarkana hospital on Friday shortly before the court hearing, though it was unclear why she was there. A hospital spokeswoman didn’t return a phone message seeking comment.

Delk said the Richardsons were expecting their first child in October. Shannon Richardson also has five children ranging in age from 4 to 19 from other relationships, four of whom had been living with the couple in the New Boston home, the attorney said.

Nathaniel Richardson works as a mechanic at the Red River Army Depot in Texarkana, Texas, a facility that repairs tanks, Humvees and other mobile military equipment. He and Shannon were married in October 2011.

According to court records, Shannon Richardson is in federal custody. The government is requesting that she be held without bond, and a detention hearing is scheduled for next Friday, the records show.

The FBI is investigating at least three cases over the past two months in which ricin was mailed to Obama and other public figures. Ricin has been sent to officials sporadically over the years, but experts say that there seems to be a recent uptick and that copycat attacks — made possible by the relative ease of extracting the poison — may be the reason.

If inhaled, ricin can cause respiratory failure, among other symptoms. If swallowed, it can shut down the liver and other organs, resulting in death. The amount of ricin that can fit on the head of a pin is said to be enough to kill an adult if properly prepared. No antidote is available, though researchers are trying to develop one.