(WSVN) - A chilling chase on a South Florida highway came to a shocking end after deputies stopped a suspect’s run from the law and came across a disturbing discovery during the arrest.

The 50-mile pursuit ended with an arrest after Martin County Sheriff’s Office deputies cornered a teenager who, they said, killed someone, threw the body in the back of his pickup and took off.

“This is an outlier case, a very rare case,” said Martin County Chief of Staff Deputy John Budensiek. “A never case, actually.”

Investigators said it started when someone called 911 after they watched someone shoot another person in Palm Beach County.

Authorities said the suspect tried dragging the body to a canal with an accomplice, then put it in the back of the truck and took off.

Investigators identidied the suspect as 17-year-old Carlos Castaneda.

Deputies followed the truck north on Interstate 95 into Martin County, hitting speeds of 100 miles per hour, where more law enforcement was waiting.

The truck drove off the major highway and even into the woods before heading back out onto the street.

That’s when one deputy attempted a pit maneuver, sending the Ford F-150 spinning out and into the side of the grass.

Law enforcement pinned the truck into place and jumped into action with guns drawn.

Castaneda was placed under arrest. The woman who was with him also surrendered.

“For our guys to be involved in a pursuit, and then subsequently to find a deceased person in the bed of a pickup truck, while they had some intel saying this was the case, was still shocking to all of us,” Budensiek said.

Castaneda faces felony charges in Martin County as well as Palm Beach County.

Deputies have not revealed the identity of the woman who was with him.

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