NORWELL —

It is a routine students at South Shore Charter Public School know too well.

As news of Erin Leary’s death spread through the tight-knit community this week, a familiar process began: Students, and faculty rallied together to support Leary’s family and cope with yet another loss.

Leary is the fourth student from South Shore Charter Public to die in three years. Since 2006, the school has lost students to car crashes, leukemia and suicide.

For the small Norwell school, where a graduating class barely exceeds 20 students and friendships span all grade levels, news of another death was devastating.

“It’s so many deaths in such a short time at such a small school,” said director Pru Goodale, who notified students Friday. “It’s just so much for them to absorb.”

Goodale said the school has become painfully familiar with the necessary steps that follow a death. Grief councilors are called in, families are notified, and students are comforted.

“We’re like a family,” said Carly Anne Hayes, a 2009 graduate whose sister, Alison, died of leukemia last year.

Hayes said the deaths have only strengthened a bond forged early on, as the new school moved to three locations before settling in Norwell.

“We’ve grown through these things,” Hayes said. “They always bring in outside councilors, but we never seem to need them as much as they expect because we have each other.”

Parents of students who have died continue to bond together in support of the school and each other, Goodale said.

A memorial garden was planted on school grounds by mothers of the students, and a scholarship to pay for mandatory defensive-driving lessons was started by Lucy Wightman after her daughter, Torri was killed in a 2006 crash.

Goodale said grief councilors will be available at the school Monday, and more help will be available to students when school starts in September.

The wreckage came to rest against a guardrail.

By Jack Nicas, Globe Correspondent

Two teenagers were killed and three others were injured today in a crash this morning on Route 1 in Revere, authorities said.

A 2000 Mitsubishi Montero carrying five people rolled over at 11:17 a.m. on the Route 1 elevated roadway above the Route 60 rotary, according to Trooper Thomas Murphy, a State Police spokesman. The three survivors were taken to Massachusetts General Hospital in Boston.

Northbound lanes were closed for more than two hours, but police opened one lane by midafternoon, leaving one lane closed for investigation of the crash.

“The investigation is ongoing and fluid at this point,” said Dave Procopio, State Police spokesman, in an e-mail.

The car struck a guardrail on the right side of the road, then rolled over, stopping on the left shoulder, Murphy said.

Killed were a 16-year-old girl from Hull and a 17-year-old boy from Ipswich, who were sitting in the back left and back center seats, respectively. The boy was the only passenger not wearing a seat belt. Both were pronounced dead at the scene.

Three others, the 19-year-old driver from Weymouth, a 17-year-old from Weymouth, and a 17-year-old from New Hampshire suffered serious injuries, Murphy said.

“Considering the traffic in the area, we’re lucky there weren’t more fatalities,” Murphy said, while briefing reporters in a movie theater parking lot along Route 1 near the crash.

It was the second fatal crash in the Boston area within an eight-hour period. Christopher L. Leavitts, 26, of Woburn, was killed about 3:02 a.m. today when his car veered to the right, struck the guardrail in the breakdown lane, and then rolled over on Interstate 93 North in Somerville.

Leavitts was driving a 1992 Toyota Camry that veered to the right, struck the guardrail in the breakdown lane, and rolled over, coming to rest in the two right travel lanes. Leavitts, who was not wearing a seat belt, was pronounced dead at the scene.