I've been researching Manhattan Jane Doe 2003 as well. On one thread, they're talking about Cynthia Constantine, who I also had on my list. Also Patricia McGill, who I know has been widely discussed on here in connection w/MJD2003. Her age is off, but she looks very small and slight for her age from many of the images I've seen of her. And Priscilla Giordano McGee.
I haven't see Alexis Owens mentioned as often, and I'd wonder if she could be MJD2003. Found this: Name: Alexis Christina Owens MJD2003
Case Classification: Endangered Missing
Missing Since: April 15, 1987
Location Last Seen: Port Orchard, Kitsap County, Washington
And this: Date of Birth: March 9, 1971
Age: 16 years old
Race: White
Gender: Female
Height: 5'2" (157 cm)
Weight: 120-150 lbs (68 kg).
Hair Color: Dark blonde
Eye Color: Blue/green
Nickname/Alias: Kris, Chris, Chrissy Owens, Amy Owens, Sherry Ann Mc Gallion
Distinguishing Marks/Features: She has a mole on her right cheek
I haven't seen Carol "Kitty" Donn mentioned as often:
NCMEC Number 108725
Missing Age 17 Years
Current Age 60 Years
Legal First Name Carol
Middle Name Elaine
Legal Last Name Donn
Chosen Name/Nickname/Alias Kitty
Biological Sex Female
Height 5' 6" (66 Inches)
Weight 120 lbs
Race / Ethnicity White / Caucasian
Circumstances of Disappearance Per law enforcement, Donn left home on January 2, 1981 while her mother was at work. All of Donn's belongings were left behind including her purse. Donn had runaway several times in the past but usually returned within several weeks. Once she went as far as New York. There has been no contact with Donn since she left home.
Jewelry
HOMEMADE PENNY EARRINGS
Also had listed Peggy Ann Reed, who traded rings with her older sister earlier before disappearing in 1974. Tracy Marie Kroh, PA, but they had a very strong suspect on that who was local.
The pouring of cement for 2003 MJD really interested me, and I see someone asking if it's connected with the 2008 NY Jane Doe, who also was found in a cement slab in a building that had a club (in Tribeca). I would definitely think these cases could be related. Incidentally, Rex Heuermann worked on a building literally down the street (I "streetviewed" it) from the 2008 site. He worked at multiple buildings like five minutes away from the 2003 site.
I see really, really wide ranges in terms of the date when 2003 MJD would actually have been murdered. I have a bad feeling she may have been an undocumented Irish immigrant who fell out of touch with her family back in Ireland in her time in the US, meaning we may never know who she was. If the 2003 and 2008 cases do turn out to be related, probably the best hope of finding her identity would be to find out who 2008 Jane Doe is, who killed that victim, and see if that killer could be the 2003 Jane Doe killer. I'd say it could be "worked" the other way around as well, but I don't know it is possible to track this Jane Doe's identity.
I don't think Judith is the 2003 MJD, but I can't help but notice the striking resemblance between Judith and Shannan Gilbert.