Pregnant Massachusetts teen Kylee Monteiro missing after argument with boyfriend

An 18-year-old recent Massachusetts high school graduate, who is about three months pregnant, disappeared after an argument with her boyfriend.

Kylee Monteiro, 18, was last seen on Aug. 7 near County Street in Rehoboth — about 50 miles from Boston, according to The Rehoboth Police Department.

Monteiro’s family said they last heard from her through a text message on the day she disappeared, and they feared for her safety, WCVB 5 reported.

“The last known time when we heard her voice was Wednesday night,” Monteiro’s sister, Faith, told the outlet.

A friend of Monteiro’s also expressed concern for her well-being, saying her last contact felt unsettling.

“She was like ‘I don’t feel safe right now something’s not right.’ I tried talking with her after that, and she just stopped responding to me after that,” the friend, who was not identified, told WCVB 5.

“I just want her to know that like, we miss you, and we’re not going to stop trying to find you.”

Monteiro is 6’0, with light brown hair and blue eyes. She was last seen in a red “Get Over it” T-shirt, ripped blue jeans, and carrying a white bag.

Her disappearance comes two months after she graduated from Attleboro High School.

The Rehoboth Police Department launched an extensive search for the teen, using K9s, helicopters, drones, ATVs, and divers in nearby bodies of water, WJAR reported.

Faith said police are thoroughly investigating her sister’s disappearance.

Monteiro’s other sister, Catherine, said she is usually very active on social media, “especially on TikTok and Snapchat,” but since vanishing, “absolutely nothing” has appeared on her accounts.

“The smallest detail is important and if there are hundreds of people going through the woods, they might not find it,” Catherine pleaded with the public.

“There’s so many scenarios that have gone through all of our heads, so many theories that everybody has, it’s all skepticism at this point. We don’t know what happened to her but we’re not giving up hope,” Faith said.