Evelin Valibayova went missing about a year ago and authorities believe something bad happened to her.
Authorities have recently renewed their effort to locate Valibayova who lived in Quincy and was last seen returning home from her shift at Area Four restaurant in Cambridge on July 17, 2011. She was 23 when she went missing.
Her LinkedIn profile said she graduated from American University and was a business administration graduate.
New billboards are going up in Greater Boston that seek clues in her disappearance.
Foul play is suspected.
A pair of young men were seen on MBTA surveillance cameras using Valibayova's Charlie Card after she was last seen.
Anyone with information can call an anonymous tip line at 617-593-8840.