STRATFORD — Jeffrey and Jessica Stein, a married couple from Brooklyn, N.Y., who died in a car crash in Stratford Saturday, were a “beautiful” pair who were devoted to the four children they left behind, relatives said Tuesday.

The Steins were headed to a baby shower in Massachusetts, Jessica Stein’s native state, when the crash happened, Jeffrey Stein’s brother and sister-in-law Craig and Michele Stein said.

Connecticut State Police said troopers responded at about 10:15 a.m. Nov. 7 to Interstate 95 north near the Exit 32 ramp. Jeffrey Stein was driving a Mazda CX-9 with his wife as a passenger when, for an unknown reason, the car veered from the left to the right across all lanes and onto the grass, hitting a traffic sign support and a tree. Jeffrey Stein, 54, and Jessica Stein, 44, both were pronounced dead at the scene, police said.

Jeffrey Stein did not drink or abuse drugs, Craig Stein said, and the crash likely was due to a medical issue he did not want to describe further.

He said his brother grew up in New Jersey and Long Island, one of three siblings. Jeffrey Stein graduated from the University of Delaware and had worked as chief administrator for the Nassau County District Attorney’s Office, Craig Stein said. He said his brother also was involved in Democratic politics in the New York county. At the time of his death, Jeffrey Stein was a business improvement consultant, Craig Stein said.

The couple, who had been married for about 10 years, had a seven-year-old daughter and a five-year-old son, and Jessica Stein had two children, ages 15 and 21, from previous relationships, Craig Stein said. He said his brother and Jessica met at the Omega Institute in Rhinebeck, N.Y., described on its website as a nonprofit educational organization “at the forefront of holistic studies.”

Jeffrey Stein was a huge New York Giants fan and had been on the season ticket waiting list since age 14, his brother said. He also described his brother as “calm under pressure.”

“He kept his cool all the time,” Craig Stein said.

Jessica Stein graduated from Cornell University and went on to graduate studies at Columbia University, Craig and Michele Stein said. Jessica had been working as a therapist, focused on children at risk of harming themselves, Michele Stein said. At the time of her death, Jessica Stein was looking forward to opening her own therapy practice, Craig Stein said.

“Jessica was a radiant human being,” he said. “She had the best smile and she loved everybody. When you met her, she wanted to know about you.”

The family launched a GoFundMe to support the four children. Funeral arrangements were incomplete as of Tuesday, Craig Stein said.