Olivia Ambrose, 23, is being evaluated at a nearby hospital "where she appears to be in good health," Boston Police Department Commissioner William Gross told reporters at a news conference.
A 38-year-old Charlestown man identified by police as Victor Pena was arrested and charged with kidnapping on Tuesday after Ambrose was found inside his apartment, Gross said.
“When we made entry she was observed standing in the apartment near the suspect," the police commissioner said. "We eventually separated them and the suspect was apprehended."
While police are still investigating the situation, Gross said "it's obvious from video surveillance [Ambrose] did not go along [with Pena] willingly."
Ambrose was last seen around 11 p.m. Saturday leaving Hennessy's bar, where she was with her twin sister and friends. Police said she left with a man who was later determined not to be connected to her disappearance.
Around 11:40 p.m., Ambrose was spotted on surveillance video with "two unknown males." One of them walked ahead of Ambrose, while the other "place[d] his arm around" her, police said, and later identified as Pena.
Surveillance video from around 12 a.m. showed Ambrose "being accompanied by that same male, still with his arm around her," leaving a train station in Charlestown. At 12:13 a.m., Ambrose and the man were spotted walking, and soon after, the woman's phone was recorded as being in a nearby housing development.
Ambrose's family in a statement released Tuesday night said they're "grateful" for those who assisted in the search to find the 23-year-old, and thanked Boston Police, Massachusetts Bay Transportation Authority and Transit police, as well as Hennessy's bar for their help.
"The Ambrose family is also so appreciative of all the efforts, prayers and good wishes of their friends, family and complete strangers who have helped in the efforts to find Olivia," the statement continued. "And finally, they want to thank Olivia's co-workers at Toast who sprang into action and were instrumental in getting the word out. The family is overjoyed."