Rohan Levy, 15, was fatally shot in a daytime attack near his Brooklyn home on Feb. 20.

The family of a Brooklyn teen shot to death in a daytime attack on a street near his home had harsh words Sunday for the suspected killer who jumped in a car and sped off.

“How can you live with yourself?” said Jennifer Smith, 55, whose grandson, Rohan Levy, 15, was shot in the head Feb. 20 as he stood outside with a group of friends near his East Flatbush home. “How can you go to sleep at night while you walk around taking the lives of innocent children?”

Smith was speaking Sunday to a crowd of nearly 100 people who gathered near the family’s home near Lenox Road.

Rohan died three days later at Kings County Hospital. Another teen who was shot was treated at a hospital and released.

Surveillance video showed the suspected gunman jumping into a gold Honda as it rode along E. 55th St.

No one has been arrested. Cops said they believe the shooting was gang-related, though they said the shooting victims were not affiliated with any gangs.

Nadine Levy, 34, surrounded by family and friends, said life after the death of her eldest child and only son will never be the same.

“How can I live here? How can I walk outside?” Levy said between sobs. “His blood is on the street that we live on.”

The grieving mom said her son was a loving and responsible child.

“He was always laughing and always joking with everyone,” she said. “He was a pain, but he was perfect. He got good grades. He never got into any trouble.”

The gunman fled in this vehicle.

Rohan was scheduled to begin an architecture internship at Williamsburg High School for Architecture and Design and was excited to attend college, Levy said.

She called for an end to the senseless violence.

“You shouldn’t be unsafe in your own neighborhood,” Levy said. “It shouldn’t be like this. It shouldn’t be like this for any of the kids that are here. They shouldn’t be afraid to be here.”

Rohan’s many friends and current and former classmates described him as someone who could always be counted on for a laugh or smile.

“If you were down, he would always find a way to cheer you up,” said classmate Angelique Montedeoca, 16. “School’s not going to be the same.”

Ivanaliz Sanabria, 17, said Rohan’s sense of humor and fun-loving nature made him popular among their friends.

“He was always full of joy and full of jokes,” she said. “The energy is different now. I’m going to walk through the hallways and start crying. It doesn’t feel real.”

Terrell Smith, 16, who had known Rohan since they were toddlers, said life without his oldest friend will be hard.

“He would make funny jokes if you were sad and make you laugh,” he said. “That was my friend for 15 years, and now he won’t be here with me.”