A massive search was launched, but turned up little evidence.
To date, police have not named any persons of interest or suspects in the case.
If you have any information regarding any of these five cases, please contact the San Francisco Police Department at (415) 558-5508.
HEATHER ELVIS Heather Elvis was last seen on December 18, 2013, near her Myrtle Beach, South Carolina apartment after a date.
In February of 2014, more than a year after Heather's case captivated the nation, Sidney and Tammy Moorer were charged with murder and kidnapping in the case.