Robuck's visitation and funeral will be held at Grace Church in Racine, Wisconsin.
A second spa shooting victim, Maelyn Lind, will be laid to rest on Sunday.
The third victim, Zina Haughton, will have a private service, according to her family.
Haughton's estranged husband, Radcliffe Haughton, is the alleged killer. Officials say he shot all three women before turning the gun on himself. He also died.
Authorities had been called to Haughton home almost 20-times over several years for domestic problems.