A teenager who was shot in Queens earlier this week has died.

Sanjay Samuel, 13, was shot in the head Monday morning near a Dunkin' Donuts in Cambria Heights and taken to a local hospital in critical condition. His mother told CBS News New York on Tuesday that Samuel was brain dead.

His family said additional tests failed to detect any brain activity Wednesday afternoon. He was pronounced dead at 12:35 p.m.

Police say it's unclear if Samuel was the intended target. No arrests have been made at this time, and the investigation is ongoing.

"My whole world has crumbled apart"

Samuel's family said his organs will be donated to save other lives, and they are now making funeral arrangements.

"My heart is overwhelmed with grief for my Sanjay," mother Vilene Griffith said.

"So heartbroken. Because I would be at his bedside, hold his hand, talking to him. 'Daddy loves you,'" father Theophilus Samuel said. "According to the doctors' reports, there was nothing more they could have done."

Griffith said she last spoke to her son right before he left for school on Monday.

"He said, 'Mom, bye.' I said, 'Love you. See you this afternoon.' I said, 'Call me when you get there,'" Griffith said. "I got a call that said Sanjay's at the hospital, he's been shot, and my whole world has crumbled apart."

"We are looking forward for justice in this particular case"

The family wants the person who pulled the trigger to answer for taking the beloved son and nephew away from them.

"This is the last thing ever in my mind that I would have thought could have happened to Sanjay," Griffith said. "That's something that's unbelievable. I'm numb. I'm speechless. I'm just numb."

"We are looking forward for justice in this particular case. We are looking forward for changes in the community," said Elvin Griffith, the victim's uncle.

Now, a mother is struggling to accept her new reality -- life without what she says has been the happiest part of her home.

"There's no more Sanjay in the house. No more Sanjay in the neighborhood," Vilene Griffith said. "Sanjay will be surely missed by everyone. Everyone. Everyone."