The woman who called police told detectives that she found the foot under some sea grass near the beach.
After searching the area with K-9 and air units, units from the Martin County Sheriff’s Office were only able to find the matching shoe.
"We don't know a lot right now on how long it has been in the water but our investigators do not believe it was for an extended period of time," said Martin County Sheriff William Snyder.
The foot is being analyzed at a crime lab and detectives are still hoping to find the rest of the remains. Snyder expects to have a DNA match at some point on Thursday.
Investigators believe the appendage may have detached from a body that was decomposing in the water.
The sheriff’s office said that there are no missing person cases in the county and that they are contacting other local departments to see about open missing person cases in other jurisdictions.