A Mississippi martial arts instructor appeared in federal court yesterday to face charges in connection with mailing letters containing the deadly poison ricin to President Barack Obama and other US officials.

The letters were found days after Boston bombings

Everett Dutschke, 41, was arrested on Saturday in Tupelo, Mississippi, after authorities searched his former business and home. He is charged with developing and possessing ricin and attempting to use it as a weapon.

Wearing an orange prison jumpsuit, Dutschke responded briefly to a judge’s questions at the hearing in Oxford, Mississippi, on whether he understood the charges against him.

The judge ordered a preliminary hearing be held on Thursday when prosecutors will present more detailed evidence in the case.

Dutschke has denied having any involvement with the ricin letters and said he cooperated with federal officials during their searches. He faces a possible life sentence if convicted.

Dutschke’s arrest came nearly two weeks after suspicious letters intended for Obama and US Senator Roger Wicker of Mississippi were intercepted in Washington.

Tests showed they were tainted with ricin, a highly lethal poison made from castor beans. A separate ricin-lased letter was also sent to a Mississippi judge.

Authorities initially arrested another Mississippi man, Kevin Curtis, but dropped the charges last week after a search of his house failed to turn up any evidence of his involvement.

Dutschke’s name surfaced at a court hearing when Curtis’ attorney suggested someone framed her client and mentioned a running feud between the two men.

He faces charges in a separate case related to an indictment for fondling three children between ages seven and 16, from 2007 to 2013, according to court records.

The ricin-tainted letters were discovered just days after the bombings of the Boston Marathon and during the massive police manhunt for those responsible, helping to fuel anxiety in the US.