Roisin O'Neill sobbed and apologized to the victim's family in court Thursday.
The father and brother of the 24-year-old woman from Willistown Township, Chester County, have also had legal problems. Sean O'Neill Sr. was sentenced last month to 18 months in federal prison. Prosecutors say he hid ties to an Irish Republican Army-linked youth group, among other things. He faces deportation to Ireland when he leaves prison.
Sean O'Neill Jr. was 17 when he accidentally shot and killed a high school friend during an unsupervised 2006 party. He has completed his sentence.