"Actually, the correct way for Jr. and Sr. suffixes is with a comma. Numbered suffix; I, II, III, is without a comma."
Sorry, Chuck, not according to my bible -- the Associated Press Stylebook and Libel Manual:
"junior, senior Abbreviate as Jr. and Sr. only with full names of persons or animals. Do not precede by a comma: Joseph P. Kennedy Jr.
"The notation II or 2nd may be used if it is the individual's preference. Note, however, that II and 2nd are not necessarily the equivalent of junior - they often are used by a grandson or nephew."