East Hampton High School's class of 2019 graduated on Friday, and this group of seniors, according to Adam Fine, the high school principal, is particularly well equipped to deal with the challenges life brings them next.

Tenia Campbell's mother, Vanessa McQueen, tried to calm her down over the phone as a countywide search for Ms. Campbell and her daughters ensued. "I asked about her twin baby girls and she said they are already dead. 'I killed them with my bare hands,' " Ms. McQueen told police in a written statement.

"There is nothing we can do now but hope we get justice," Rolando Garces, a brother of the victim, said after Joseph A. Grippo's indictment on second-degree murder charges was unsealed Friday morning.