Mar 10, 2021 YOUNGSTOWN — A federal court filing describes threats an FBI agent says the father of the victim of Friday afternoon’s homicide on Market Street made on his Facebook page that evening. The postings, including videos, threatened to take revenge on those involved in his son’s death and family members of those involved. The threats led to city man Damon Irby Jr., 44, being arrested Tuesday and being placed in the Mahoning County jail. Irby will remain in the jail until at least until a detention hearing in U.S. District Court Monday, according to federal court documents. A criminal complaint filed Tuesday accuses him of being a felon in possession of a firearm related to a 2019 investigation.