People have expressed curiosity why Kevin James Loibl—the 27-year-old man who fatally shot "The Voice" singer Christina Grimmie in the head in Orlando, Florida last June 9—singled her out as his victim. They wonder whether she was attacked because of her Christian faith.

Loibl's former colleagues at Best Buy have now provided clues to the mystery. They told TMZ that Loibl had an unhealthy fixation on Grimmie—to the extent of having hair transplants and Lasik eye surgery, and adopting a vegan diet to lose weight—in the hope of increasing his chances of dating the singer.

As what he told his former co-workers, Loibl claimed that he personally met Grimmie at one of her shows last March and also played online games with her. However, source close to the singer refuted this.

The apparently infatuated gunman, who enjoyed listening to Grimmie's songs at work, reportedly even boasted to his co-workers that Grimmie would one day become his wife.

When he learned that Grimmie's producer had become her boyfriend, his colleagues allegedly teased him relentlessly, telling him that all his efforts to woo the singer turned out to in vain.

Loibl apparently became so enraged with Grimmie's relationship status that he travelled to Orlando, sought Grimmie out while she was signing autographs for fans, and shot her. He then tried to escape after the shooting, but Grimmie's brother Marcus tackled him before fatally shooting himself.

Family and friends held a vigil in honour of Grimmie in her hometown of Evesham, New Jersey, last Monday, according to The Christian Post. Marcus told the 500 attendees that his sister "loved the Lord with all of her heart and had her arms "wide open" when Loibl shot her.

"She loved this town. She loved the state. She loved singing. She loved the Lord. And she loved me and she was just my baby sister," said Marcus. "The tragedy that took place –it was a free meet and greet post show. I missed the very first glimpse but witnesses say that she was arms open wide. So she had no idea. She treated everybody the same. And it was hard for her because she was introverted."