There's still no solid evidence of what happened.

January 2, 1999. It was a day Kimber Biggs will never forget. Her 11-year-old sister Mikelle went missing in a neighborhood near Gilbert Road and Southern Avenue in Mesa.

“She was out riding my bike... she was out on the corner at the ‘T’ in the road and she was waiting for the ice cream truck and I got cold… went inside,” Biggs said. “Turned around and walked back out and walked to the end of the driveway and by that point she was already gone and that’s when I saw my bike laying in the road.”

Mikelle’s body was never found. There’s still no solid evidence of what happened.

Fast forward nearly 20 years later now, she says there’s a piece missing.

“There’s a whole piece of our lives that was literally taken from us,” said Biggs. “It feels weird saying it, but I am grateful for the effect everything had on me, despite all the negative side effects.”

Biggs says she’s more protective when it comes to her son and she feel empowered to raise awareness about missing children.

Today, she feels her sister is no longer with us, but rather an angel above.

“It really wasn’t until I saw my son react to her picture for the first time seeing it, it was like he knew her, he recognized her,” she said. “He was about eight or nine months old.”

She continues to raise awareness about her sister’s case along with thousands of other missing children on her sister’s remembrance Facebook page.

While Biggs doesn’t really know what happened to her sister, she believes one day her family will find out, and she won’t stop telling her story until that happens.

The Mesa Police Department actively investigates new leads on this case anytime they come in. Anyone with information about Mikelle's case is asked to call Mesa Police at 480-644-2211.

Kimber will take part in the Missing in Arizona Day will be held on Saturday, October 27 th at ASU’s west campus from 10-4 concluding with a candlelight vigil for the missing.