There were no witnesses to the will the decedent signed. Is the will valid?d

In Florida a will must be signed by two witnesses in addition to the person making the will.  The failure to have two witnesses will invalidate the last will.  If a will is invalid under Florida law, then the assets that are subject to probate must be distributed according to the Florida intestacy statute (F.S. 732.101 - 732.111). I suggest that you contact a Florida probate lawyer to assist you with the probate of the estate through the intestacy statute.