A religious group asks the FBI to help investigate the death of a Sikh man in California

Parmjit Singh

(CNN)A Sikh group is asking the FBI to investigate the recent killing of a Sikh man whose body was found near a park in Tracy, California.

According to police, Parmjit Singh, 64, was stabbed and left to bleed to death Sunday night while taking a routine walk to Gretchen Talley Park.
The United Sikhs, a United Nations-affiliated humanitarian relief organization, asked for the federal investigation and suggested Singh's death was motivated by prejudice.
Singh's son-in-law Harnek Kang, 40, told CNN that Singh was "very loving" and a "very nice man" who immigrated three years ago from India, where he worked as a farmer.
    Singh, who lived with Kang, leaves behind a wife, a son and a daughter, and three grandchildren, Kang said. "It's a very big loss for the family. He's so close to my heart."

    A community mourns

    On Wednesday night, dozens in the community attended a candlelight vigil held in honor of Singh at the same park where he died, said Kang. "All the community in Tracy -- they are supporting me so much," he said through his tears. "Only thing I can say is thank you to all my neighborhood and fellow Americans and Sikh community during this tragic time in my life."
    On Tuesday, the Tracy Police Department released a video and requested the public's help in identifying a potential witness seen near the park around the time that officers discovered Singh.
    "We take pride in our safe, close-knit community. This violence will not be tolerated and we are dedicating every available resource to ensuring that the person(s) responsible for the death of Mr. Singh is brought to justice," Tracy Mayor Robert Rickman said.