78-year-old Atwal and his neighbourhood friend Surinder Singh, 65, were shot on March 4, sending shock waves among the Sikh community in the region. Singh had died on the spot.
Atwal had been on a ventilator and unable to talk since the incident, which took place in the Sacramento suburb of Elk Grove. He died in hospital at 2 pm local time yesterday.
"He's no more," Atwal's son Kamaljit Singh said. "First the kidneys went off, then the lungs and then brain. ... He was shot in the upper right chest, one bullet went straight to his lungs and the other to his pancreas, liver and intestines," he was quoted as saying by 'The Modesto Bee', a local newspaper.
"My dad was going to be a key witness" in the shooting. But "from day one, he could not speak a word," Kamaljit said.
Darshan Mundy, Public Relations Officer for the Sacramento Sikh Temple, said the community "is in mourning after learning of Mr Atwal's passing."
"Mr Atwal fought valiantly to recover after the shooting. We all hoped that he would be able to overcome the critical injuries. Now, we must rely on our faith as we support the family in making it through this difficult time," Mundy said.
Atwal is survived by 10 grandchildren, his wife Balbir Kaur, daughter Talvinder Kaur and sons Kamaljit Singh, Balkar Singh and Sarbjit Singh. He lived with Kamaljit and his family at their home in Elk Grove.
Born and raised in Punjab, Atwal moved to the US after retirement. "We all hoped that he would recover and thus give us the clue, but it is very unfortunate that he died," said Gurjatinder Singh Randhawa, from the NRI Front USA.
The Sikh Community and a number of community organisations have come together to offer a reward of over USD 42,000 for information leading to the arrest of those responsible for the shooting.
Crime Alert Sacramento is offering an additional USD 10,000 reward if it is determined to be a hate crime. According to family members, the victims were not robbed and had no enemies. However, they were wearing turbans at the time of shooting and had thick beards, leading police and community leaders to suspect that the attack was a hate crime.
