Updated 8:30 p.m., Sunday.
Junior Fernandes, 22, of Dorchester, was arrested this afternoon on charges of murder, unlawful possession of a firearm and unlawful possession of ammunition.
Castellon, known to her friends as A Banga, is Dorchester's 16th murder victim this year (map).
Updated Monday morning. Complete list and map of violent crimes over the weekend.
At least sixteen people were shot this holiday weekend, four fatally.
That came not long after two people were stabbed at 53 Thomas Park in South Boston, and about the same time as somebody was shot in the arm at 114 Glenville Ave. in Allston, according to AlertNewEngland.
UPDATE: Boston Police report the victim died.
AlertNewEngland reports a man was taken away from 60 Hollander St. in critical condition after being shot around 8 p.m.
Updated at 9:30 p.m.
Police are looking for a suspect who may have fired into a car on Blue Hill Avenue near Harvard Street, fatally wounding a man and injuring his female companion in front of a troubled building.
Boston Police report the two were shot around 2:40 p.m. outside 826 Blue Hill Ave., where police have conducted drug investigations in the past and which has had a history of illegal after-hours parties.
The two managed to get themselves to Boston Medical Center, where the man, 47, was pronounced dead not long after his arrival. The woman, 44, is expected to survive, police say.
This is the second time in less than a week part of Blue Hill Avenue had to be shut down for a murder investigation. Blue Hill Avenue was shut near Geneva Avenue on Friday when a man was shot to death.
Boston Police report two 23-year-old men were shot, one fatally, around 10:15 p.m. at 115 Brookway Rd. by the Archdale housing project.
The surviving victim was taken to Brigham and Women's Hospital in critical condition, police say.
Boston Police report finding a man with a gunshot wound outside 29 Selden St. around 9:40 p.m., Sunday.
He was transported to Boston Medical Center, where he was pronounced dead.
UPDATE: Teen arrested, charged with murder.
Boston fire inspectors and police homicide detectives are now on the scene of the fire, a two-story home.
Boston's last fatal fire was also in East Boston, on May 29, 2010, when two people died in a fire started by an extension cord shorting out.
UPDATE: Man arrested for murder of Andrew Wyman, claims self defense.
A man stabbed right outside Boston Medical Center around 8:20 a.m. was rushed into surgery there but died, Boston Police report. Police identified him only as a white male in his late 20s.
He was transported to Boston Medical Center, where he was pronounced dead. Stanley Staco reports he was shot in the back.
Immediately following the shooting, police were looking for two black males in a red truck with New York plates.
Tbe Dorchester Reporter reports the teen lived next door to Isaura Mendes, a peace activist who has lost two sons of her own to murder.
Boston Police report two men were shot outside 285 Tremont St. around 2 a.m. Both got themselves to Boston Medical Center, where one died.
Two men were arrested following the shootings - additional gunfire inside a garage at 275 Tremont St. - but have not been charged with the murder. Andrew Flonory, 26, of Brockton and Joshua Hollis, 22, of Cambridge, were both charged with unlawful possession of a firearm. They were scheduled for arraignment today in Boston Municipal Court.
Flonory is the brother of Eyanna Louise Flonory, who was gunned down with her toddler son and two others in a Mattapan bloodbath last year. Flonory himself survived a murder attempt at the Ashmont T stop last July.
Police did not identify the murder victim, but friends have identified him as Roc Dukati, a local hip-hop MC who had said he was planning an appearance at Underbar, a Tremont Street club, last night.
Boston Police report a man was stabbed to death around 10 a.m. today at 80 Ames Way in Franklin Field.
Cherry Clinton, 28, was arrested for what police say was a "domestic" murder. The victim, not identified by police, was pronounced dead at the scene.