ENTER-MUS-SMITH-SON-GET

Granger Smith and Amber Smith visit Dell Children's Medical Center of Central Texas to present a donation in memory of their son, River Kelly Smith, on June 25 in Austin, Texas.

The wife of country singer Granger Smith has revealed that their late 3-year-old son, River, saved the lives of two adults through organ donations.

Amber Smith shared the news in an emotional Instagram last weekend, a little over a month after the young boy tragically died in a drowning accident.

"We got the letter that our tiny, red-headed hero gave life to two adults. A 49-year-old woman and a 53-year-old man," Amber captioned a photo of River with a big smile on his face.

"I cried when we opened it," she continued. "Cried out of sadness and cried out of love. I'm so proud to be River's mama, and I'm so grateful to God that he gave him to us for those incredible three years. I pray these two recipients live healthy, joy filled, full throttle lives just like Riv. It was one of the hardest, yet easiest, decisions we've ever made."

The Smith's announced in early June that the youngest of their three kids had passed away, with a rep for the singer later confirming to People that River died in a drowning accident.

In her new post, Amber opened up about the difficult and drawn-out process in which doctors ran tests to determine whether River's organs would be a match for donations.

"I spent the night laying in bed with him, crying and talking to him while they kept running tests and taking blood," she wrote. "The next morning family and staff lined the hall for the 'walk of honor'. We told them River liked to go fast, so to honor him, they pushed him down that hall faster than they had ever pushed anyone. Granger and I held each other and cried."

Granger and his wife have been open about their heartbreak in the weeks after their son's untimely passing.

Last month, Granger spoke about his final memory with River.

"I was outside playing with (7-year-old daughter) London," the singer said in a video alongside his wife. "We were doing gymnastics in the yard, and the boys were playing water gun fight."

He continued, "I remember thinking, I was looking at London as she was doing gymnastics, and I thought, 'Soak up this moment.' I just had this thought, 'Soak up this moment because it's not going to last forever.' Somewhere between 30 seconds and three minutes, we don't know, Amber and I are inside our pool gate doing CPR on our son."

He and Amber also thanked everyone who has supported them in that video.