UPDATE: Cause still a mystery in deadly I-75 crash, witnesses ur - WRCBtv.com | Chattanooga News, Weather & Sports

UPDATE: Cause still a mystery in deadly I-75 crash, witnesses urged to come forward

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UPDATE: The grandfather of Bobby Arruda sent the following letter to Channel 3 in hopes someone can help in the investigation:

"This is a open letter to the viewers of WRCB 3 news. My name is Robert Kieffer Sr. I am speaking for my grandson Bobby, his father, mother, sisters, and brother and his entire family. Bobby was taken from us on 1/2/2016 by a senseless tragic accident that did not have to happen. He was on his way home from Cleveland, Tennessee on I-75 when his car was hit by another vehicle and spun out of control and crossed the median and hit by a 18 wheeler. The other driver fled the scene. Someone out there knows whom it was. I am begging anyone with info to please come forward and give the information to the THP. If you don't want to be involved please call me at 774-402-1669 and I will get the information to THP. Please, we are begging for your help to catch this cold hearted person. One last thing: be thankful because it could have been one of your loved ones instead of ours. Thank you for your help. God Bless you all.

Robert Kieffer Sr. and entire family"

Investigators have no new leads in the case and are still asking the public for assistance. If you have any information that can help investigators solve the crash, give THP a call at (423) 634-6890.

Previous Story: Family and friends of a McMinn County man are desperate for answers after he was killed in a car crash over the weekend.
Twenty-five-year-old, Bobby Arruda was traveling northbound on I-75 near mile marker 24 in Cleveland on Saturday, when somehow his vehicle crossed the median and was hit head-on by a tractor trailer. What led up to the crash is still a mystery. In the meantime, his family and friends are mourning his loss.

READ MORE | UPDATE: Deadly accident shuts down I-75 in Bradley County

"It has been hard. Mentally, mostly. Sometimes I don't know how to take it," says Stevie Fisher.

Stevie Fisher says she still can not believe her best friend, Bobby, is gone.
"He meant so much to me. We were, I guess a Bonnie and Clyde, I'd guess you'd say."

The two got to know each other over the past year as co-workers.
"I gave him a ride back and forth to work and we became closer and closer," she says. "We were closer than a brother and sister could be. He could put a smile on your face in two seconds."

That is why getting the news of Bobby's death Saturday night was so hard.
"The sheriff called his work and they called me because they knew I was close to him," says Fisher.

Tennessee Highway Patrol investigators say Bobby was driving North on I-75 around 5:30 p.m.

According to a preliminary crash report, THP believes bobby's SUV "may have been contacted by another unknown vehicle," causing him to lose control, crossing the median, ending up in the path of a tractor trailer in the southbound lanes.

"It is a bit frustrating," says Fisher.

Crash investigators are urging any witnesses to the crash to come forward.
"Nobody's even seen or heard of gave any clues or anything on it," says Fisher.

For Stevie, that is the hardest part.

"He could still be here with us," she says.

Bobby's co-workers and friends in Etowah have organized a memorial for him Friday. It will be held from 5-8 p.m. at the Etowah Community Center. If you have any information that can help investigators solve the crash, give THP a call at (423) 634-6890.

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