PICTURED: Young bride-to-be, 27, and her tech entrepreneur boss, 44, who were killed when the Tesla they were driving slammed into a tree and burst into a FIREBALL

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A young bride-to-be and her tech entrepreneur boss were killed when the Tesla they were driving slammed into a tree and burst into flames.

Casey Speckman, 27, was behind the wheel of the 2015 S-Model electric car, with her boss, 44-year-old Kevin McCarthy, when the accident took place about 1am on Thursday in Indianapolis.

The Tesla was McCarthy's car. Police said it was traveling at a high speed.

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Casey Speckman (left), 27, and 44-year-old Kevin McCarthy (right) died when the Tesla they were driving slammed into a tree and burst into flames

Speckman was pronounced dead at the scene, while McCarthy was rushed to the nearby Eskenazi Hospital but could not be saved, according to the Indianapolis Star. 

Witnesses said the car 'bounced around' after crashing into the tree before it exploded. 

Al Finnell, who was driving near the Tesla, said he had to speed up to avoid debris and flames.

'It hit that tree and it bounced around and all of a sudden it just exploded,' Finnell told WTHR.

'I had to accelerate my vehicle, because all the car parts went up in the air and I had to accelerate just to get away from it.' 

He went on to say the car exploded into a 'big ball of fire'.

The car hit the tree with such force its wheels where ripped from the chassis. The electronic batteries were also damaged, which police say caused the fire. 

Speckman (right, with a friend) was behind the wheel of the S-Model electric car crashed about 1am on Thursday in Indianapolis 

Police say the car was traveling at a high speed, and that Speckman was pronounced dead at the scene

Speckman was due to marry her fiance, Brandon Seniff, next year.

Friends of the young couple said they were shocked by the devastating news.

'It's all very, very sad,' Cody Rivers said. 'My heart breaks for Brandon; I can only imagine what he's going through.'

The 27-year-old graduated from Indiana University in 2011. She met her fiance while studying at the college, and the two had spoken about how they planned to spend their future together in a letter on their wedding website.

'We have experienced and supported each other through all the great times, traumatic and sad times. We have graduated college, graduated law school, obtained first and second jobs ... living together and living apart, got a sweet puppy, bought a condominium in Indianapolis ... and did it all together!' the letter reads. 

Speckman was due to marry her fiance, Brandon Seniff, next year. The couple is pictured together

A picture from the scene of the crash shows the car after it burst into flames on Thursday morning

'We have been through nearly a decade of our lives together and are so excited to see what the future decades hold!' 

McCarthy was the president of Express Software & Services, and a former FBI special agent. 

In a statement issued late Thursday, the electric car maker said it's cooperating with Indianapolis police's investigation into the crash. 

Tesla added it appears as though the car's semi-autonomous Autopilot system was not engaged when the crash occurred.

The car sustained so much damage that it didn't transmit data to the company's servers. That data would show if the driver had the car in Autopilot mode.

The car that was being driven in the deadly crash was a 2015 S-Model Tesla (stock image)

Damage from the car crash is seen strewn across the road after the accident took place on Thursday

Firefighters arrived on the scene shortly after the accident took place in Indianapolis

But the company said the system likely wasn't engaged, because Autopilot would have limited the vehicle's speed to less than 35 miles per hour on the street where the accident occurred.

'We are deeply saddened to hear that this accident involved fatalities,' the Palo Alto, California-based company said.

Police spokesman Maj. Richard Riddle said earlier Thursday that investigators were looking at whether Autopilot played a role in the accident. 

The system, which was introduced last year, can automatically drive the car at a set speed and keep it within its lane. Drivers need to touch the wheel at certain intervals or the system will turn off.